This document provides an overview of the history and development of spreadsheet software, beginning with VisiCalc in 1979 and continuing through various iterations including EtherCalc, wikiCalc, SocialCalc, and Sheetnode. It discusses the goals and technical approaches of these different spreadsheet platforms, including making spreadsheets collaborative, web-based, and supporting large numbers of cells. The document also covers the use of spreadsheets on the OLPC project and integration with mesh networking capabilities. Overall it traces the evolution of spreadsheets from early desktop programs to modern web-based collaborative applications.

1. EtherCalc
Multiplayer
Spreadsheet
ethercalc.tw

2. Personal Opinions

3. Personal Opinions
(With Infotisements)

4. Time Limited
Just Stories
No Coding

5. Time Limited
Just Stories
Ideas
No Coding

6. ethercalc.org
‣ npm install -g ethercalc
‣ ethercalc
Please connect to: http://0:8000/
nodejs.org/#download

7. A.O.S.A., 2011
aosabook.org
aosa.tw

8. History

9. VisiCalc, 1979
Dan Bricklin

10. Harvard, 1977

11. Harvard, 1977

12. Harvard, 1977

13. Harvard, 1977

14. Harvard, 1977

15. Original Vision

16. Original Vision
Alto
Workstation

17. Original Vision
Alto
Calculator- Workstation
Mouse

18. Original Vision
Alto
Calculator- Workstation Head-mounted
Mouse Display

19. Original Vision
Alto
Calculator- Workstation Head-mounted
Mouse Display

22. =SUM( ) 0

23. 10
=SUM( ) 10
0

24. 10 20
=SUM( ) 30
10
0

25. 10 20 30
=SUM( ) 60
30
10
0

26. 10 20 30
=SUM( ) 60
30
10
0

27. 1977 → 1978

28. 1977 → 1978

29. 1977 → 1978
+
Integer BASIC

30. 1978 → 1979

31. 1978 → 1979
10 20 30
=SUM( ) 60

32. 1978 → 1979
A B C D
1 10 20 30
2 =SUM( ) 60

33. 1978 → 1979
A B C D
1 10 20 30
2 =SUM(A1,B1,C1) 60

34. 1978 → 1979
A B C D
1 10 20 30
2 =SUM(A1,B1,C1) 60
Bob & Dan

35. 1978 → 1979
A B C D
1 10 20 30
2 =SUM(A1,B1,C1) 60
‣ Dan prototypes in BASIC
Bob & Dan

36. 1978 → 1979
A B C D
1 10 20 30
2 =SUM(A1,B1,C1) 60
‣ Dan prototypes in BASIC
‣ Bob codes in 6502 ASM
Bob & Dan

37. 1978 → 1979
A B C D
1 10 20 30
2 =SUM(A1,B1,C1) 60
‣ Dan prototypes in BASIC
‣ Bob codes in 6502 ASM
‣ 700,000 copies in 6 years
Bob & Dan

38. 1978 → 1979
A B C D
1 10 20 30
2 =SUM(A1,B1,C1) 60
‣ Dan prototypes in BASIC
‣ Bob codes in 6502 ASM
‣ 700,000 copies in 6 years
‣ The !rst “Killer App” Bob & Dan

39. 1981

45. 20 years passed

46. 20 years passed

47. 20 years passed

48. 20 years passed

49. 20 years passed
Nothing changed

51. “Can’t open”

52. “Can’t open”
“Garbled”

53. “Can’t open”
“Garbled”
“Virus!”

55. Wikipedia, 2001

56. Wikipedia, 2001

57. Wikipedia, 2001

58. wikiCalc, 2005

59. wikiCalc, 2005
✓ Plain text, HTML & Wiki syntax

60. wikiCalc, 2005
✓ Plain text, HTML & Wiki syntax
✓ References cells on other servers

61. wikiCalc, 2005
✓ Plain text, HTML & Wiki syntax
✓ References cells on other servers
✓ Keeps all operations for auditing

62. wikiCalc, 2005
✓ Plain text, HTML & Wiki syntax
✓ References cells on other servers
✓ Keeps all operations for auditing
✓ Revert to any revision

63. wikiCalc, 2005
✓ Plain text, HTML & Wiki syntax
✓ References cells on other servers
✓ Keeps all operations for auditing
✓ Revert to any revision
✓ Open Source! (GPLv2)

64. wikiCalc.pl

65. wikiCalc.pl
網站
Sites
./wkcdata/sites/Foo
./wkcdata/sites/Bar
./wkcdata/sites/Baz

66. wikiCalc.pl
網站
Sites 頁面
Pages
./wkcdata/sites/Foo
XXX
./wkcdata/sites/Bar
./wkcdata/sites/Baz YYY
ZZZ

67. wikiCalc.pl
網站
Sites 頁面
Pages
./wkcdata/sites/Foo
XXX
./wkcdata/sites/Bar
./wkcdata/sites/Baz YYY
ZZZ
Cells
儲存格

68. wikiCalc.pl
網站
Sites 頁面
Pages
./wkcdata/sites/Foo
XXX
./wkcdata/sites/Bar
./wkcdata/sites/Baz YYY
ZZZ
Cells
儲存格
A1: 100

69. wikiCalc.pl
網站
Sites 頁面
Pages
./wkcdata/sites/Foo
XXX
./wkcdata/sites/Bar
./wkcdata/sites/Baz YYY
ZZZ
Cells
儲存格
A1: 100
A2: =A1*2

70. wikiCalc.pl
網站
Sites 頁面
Pages
./wkcdata/sites/Foo
XXX
./wkcdata/sites/Bar
./wkcdata/sites/Baz YYY
ZZZ
Cells
儲存格
A1: 100 B1: =XXX!C1
A2: =A1*2

71. wikiCalc.pl
網站
Sites 頁面
Pages
./wkcdata/sites/Foo
XXX
./wkcdata/sites/Bar
./wkcdata/sites/Baz YYY
ZZZ
Cells
儲存格
A1: 100 B1: =XXX!C1
A2: =A1*2

72. wikiCalc.pl
網站
Sites 頁面
Pages
./wkcdata/sites/Foo
XXX
./wkcdata/sites/Bar
./wkcdata/sites/Baz YYY
ZZZ
Cells
儲存格
A1: 100 B1: =XXX!C1
A2: =A1*2 B2: =YYY!D2

73. wikiCalc.pl
網站
Sites 頁面
Pages
./wkcdata/sites/Foo
XXX
./wkcdata/sites/Bar
./wkcdata/sites/Baz YYY
ZZZ
Cells
儲存格
A1: 100 B1: =XXX!C1
A2: =A1*2 B2: =YYY!D2

74. wikiCalc.pl
網站
Sites 頁面
Pages
./wkcdata/sites/Foo
XXX
./wkcdata/sites/Bar
./wkcdata/sites/Baz YYY
ZZZ
Cells
儲存格
A1: 100 B1: =XXX!C1
A2: =A1*2 B2: =YYY!D2
Cross-page
Reference

75. wikiCalc Edit Flow

76. wikiCalc Edit Flow
A1: 100
A2: =A1*2

77. wikiCalc Edit Flow
A1: 100
A2: =A1*2

78. wikiCalc Edit Flow
A1: 100
A2: =A1*2
POST /
ajaxsetcell=host:page:A1:300
wikicalc.pl

79. wikiCalc Edit Flow
A1: 100
A2: =A1*2
POST /
ajaxsetcell=host:page:A1:300
wikicalc.pl
200 OK
<?xml version="1.0"?>
<root><![CDATA[
A1:v:300:300:right:1:1::
A2:f:600:A1*2:right:1:1::
]]></root>

80. “Loading…”

81. “Loading…”

82. “Loading…”
“C100k” Problem

83. “Loading…”
“C100k” Problem

85. Undo

86. Undo
Redo

87. SocialCalc, 2006
Dan Bricklin Ross Mayfield

88. Design Goals

89. Design Goals
‣ Rewrite calc engine in JS

90. Design Goals
‣ Rewrite calc engine in JS
‣ Real-time responsive editor

91. Design Goals
‣ Rewrite calc engine in JS
‣ Real-time responsive editor
‣ Supports 100,000+ cells

92. Design Goals
‣ Rewrite calc engine in JS
‣ Real-time responsive editor
‣ Supports 100,000+ cells
‣ Works on all browsers (IE6+)

93. Design Goals
‣ Rewrite calc engine in JS
‣ Real-time responsive editor
‣ Supports 100,000+ cells
‣ Works on all browsers (IE6+)
‣ Client-side log & undo/redo

94. Architecture

95. Architecture
SocialCalc.js
HTTP Server

96. Architecture
SocialCalc.js
GET
HTTP Server

97. Architecture
SocialCalc.js
GET
HTTP Server

98. Architecture
SocialCalc.js
GET GET
HTTP Server

99. Architecture
SocialCalc.js
GET GET
($)
HTTP Server

100. Architecture
SocialCalc.js
PUT
GET GET
($)
HTTP Server

101. Architecture
SocialCalc.js
PUT
GET GET
($)
HTTP Server

102. Command Pattern

103. Command Pattern
set A1 value n 42

104. Command Pattern
set A1 value n 42
set A2 formula A1*2

105. Command Pattern
set A1 value n 42
set A2 formula A1*2
merge A1:B2
cut A3
paste A4
sort A1:B9 A up B down
set sheet defaultcolor blue
...

106. Command Pattern
set A1 value n 42
set A2 formula A1*2
‣ Async recalc loop

107. Command Pattern
set A1 value n 42
set A2 formula A1*2
‣ Async recalc loop
‣ Visible-only redraw

108. Command Pattern
set A1 value n 42
set A2 formula A1*2
‣ Async recalc loop
‣ Visible-only redraw
‣ Unlimited undo/redo

109. Command Pattern
set A1 value n 42
set A2 formula A1*2
‣ Async recalc loop
‣ Visible-only redraw
‣ Unlimited undo/redo
‣ UI stays responsive

110. Command Pattern
set A1 value n 42
set A2 formula A1*2
‣ Async recalc loop
‣ Visible-only redraw
‣ Unlimited undo/redo
‣ UI stays responsive

111. “Social”Calc

112. “Social”Calc

113. “Social”Calc
Comment, Like,
Tag, Share, Embed...

114. Objects Relations

115. Objects Relations

116. Objects Relations

118. Good !rst
Pro!ts later

119. Common Public
Attribution License

120. Common Public
Attribution License
ⓐ
BSD, MIT

121. Common Public
Attribution License
©
ⓐ
BSD, MIT LGPL, MPL

122. Common Public
Attribution License
© ++©
ⓐ
BSD, MIT LGPL, MPL GPL

123. Common Public
Attribution License
© ++©
ⓐ
BSD, MIT LGPL, MPL GPL
“ASP

124. loophole”

125. Common Public
Attribution License
© ++©
ⓐ
BSD, MIT LGPL, MPL GPL
“ASP

126. loophole”
Affero GPL

127. Common Public
Attribution License
© ++©
ⓐ
BSD, MIT LGPL, MPL GPL
“ASP

128. loophole”
CPAL Affero GPL

129. Common Public
Attribution License
© ++©
ⓐ
BSD, MIT LGPL, MPL GPL
“ASP

130. loophole”
CPAL Affero GPL

131. Common Public
Attribution License
© ++©
ⓐ
BSD, MIT LGPL, MPL GPL
“ASP

132. loophole”
CPAL Affero GPL

133. Common Public
Attribution License
© ++©
ⓐ
BSD, MIT LGPL, MPL GPL
“ASP

134. loophole”
CPAL Affero GPL

135. Sheetnode, 2008
Karim Ratib

136. Sheetnode, 2008
Views + Fields + CCK
Karim Ratib

137. Sheetnode, 2008
Views + Fields + CCK
SocialCalc.js
Karim Ratib

138. Sheetnode, 2008
Views + Fields + CCK
SocialCalc.js
Karim Ratib

139. Sheetnode, 2008
Views + Fields + CCK
SocialCalc.js
Karim Ratib

140. Sheetnode, 2008
Views + Fields + CCK
SocialCalc.js
Karim Ratib

141. OLPC, 2008

142. OLPC, 2008
Luke Closs Dan

145. Mesh
P2P

147. Manusheel
Gupta
Vijit Singh

148. SocialCalcActivity.py
Gecko/XPCOM
SocialCalc.js
XoCom.js
XoCom.py
Manusheel
Gupta
Vijit Singh

149. SocialCalcActivity.py
Gecko/XPCOM
SocialCalc.js
XoCom.js
set A1 value n 42 XoCom.py
Manusheel
Gupta
Vijit Singh

150. SocialCalcActivity.py
Gecko/XPCOM
SocialCalc.js
XoCom.js
set A1 value n 42 XoCom.py
D-Bus + Telepathy
Manusheel
Gupta
Vijit Singh

151. SocialCalcActivity.py
Gecko/XPCOM
SocialCalc.js
XoCom.js
set A1 value n 42 XoCom.py
D-Bus + Telepathy
OLPC Mesh
Manusheel
Gupta Broadcast
網絡廣播
Vijit Singh

152. SocialCalcActivity.py
Gecko/XPCOM
SocialCalc.js
XoCom.js
set A1 value n 42 XoCom.py
D-Bus + Telepathy
OLPC Mesh
Manusheel
Gupta Broadcast
網絡廣播
D-Bus + Telepathy
Gecko/XPCOM
SocialCalc.js
XoCom.js
XoCom.py
Vijit Singh SocialCalcActivity.py

153. SocialCalcActivity.py
Gecko/XPCOM
SocialCalc.js
XoCom.js
set A1 value n 42 XoCom.py
D-Bus + Telepathy
OLPC Mesh
Manusheel
Gupta Broadcast
網絡廣播
D-Bus + Telepathy
Gecko/XPCOM
set A1 value n 42
SocialCalc.js
XoCom.js
XoCom.py
Vijit Singh SocialCalcActivity.py

154. Great, but...

155. Great, but...
‣ Must log on same time

156. Great, but...
‣ Must log on same time
‣ Can’t replay missed logs

157. Great, but...
‣ Must log on same time
‣ Can’t replay missed logs
‣ Race condition on cells

158. Great, but...
‣ Must log on same time
‣ Can’t replay missed logs
‣ Race condition on cells
‣ OLPC-specific code!

159. YAPC::Tiny, 2009
跳格
Multiplayer
SocialCalc
二零零九 唐鳳
字
中英雙宇有字版

160. EV/AnyEvent

161. Tatsumaki EV/AnyEvent
@miyagawa

162. Tatsumaki EV/AnyEvent
Web::Hippie
@miyagawa @clkao

163. Tatsumaki EV/AnyEvent
Web::Hippie
Feersum
@miyagawa @clkao @stash

164. WebSocket Channels
multiserver.pl
Web::Hippie
Plack
Feersum
EV/libev

165. WebSocket Channels
SpreadsheetControl
multiserver.pl
Web::Hippie
ScheduleScheetCommand
set A1 value n 2046 Plack
RenderSheet
Feersum
EV/libev

166. WebSocket Channels
SpreadsheetControl
multiserver.pl
Web::Hippie
ScheduleScheetCommand
set A1 value n 2046 Plack
RenderSheet
Send Feersum
EV/libev

167. WebSocket Channels
SpreadsheetControl
multiserver.pl
ScheduleScheetCommand
Web::Hippie Relay
set A1 value n 2046 Plack
RenderSheet
Send Feersum
EV/libev

168. WebSocket Channels
SpreadsheetControl
multiserver.pl
ScheduleScheetCommand
Web::Hippie Relay
set A1 value n 2046 Plack
ScheduleScheetCommand
RenderSheet
Send Feersum set A1 value n 2046
(isRemote = true)
EV/libev
RenderSheet

169. New Features

170. New Features
✓ Fetch logs on join

171. New Features
✓ Fetch logs on join
✓ Reconnection recovery

172. New Features
✓ Fetch logs on join
✓ Reconnection recovery
✓ Show peer cursors

173. New Features
✓ Fetch logs on join
✓ Reconnection recovery
✓ Show peer cursors
✓ Cross-browser support!

174. New Features
✓ Fetch logs on join
✓ Reconnection recovery
✓ Show peer cursors
✓ Cross-browser support!

175. Much better, but...

176. Much better, but...
‣ Which peer’s log to take?

177. Much better, but...
‣ Which peer’s log to take?
‣ What if everyone leaves?

178. Much better, but...
‣ Which peer’s log to take?
‣ What if everyone leaves?
‣ Who would keep the logs?

179. Much better, but...
‣ Which peer’s log to take?
‣ What if everyone leaves?
‣ Who would keep the logs?
‣ Replay 1,000+ commands?

180. Much better, but...
‣ Which peer’s log to take?
‣ What if everyone leaves?
‣ Who would keep the logs?
‣ Replay 1,000+ commands?

182. Undo

183. Undo
Redo?

184. YAPC::NA, 2006

185. YAPC::NA, 2006
“I think, but I cannot prove, that by
the next year JavaScript 2.0 will
bootstrap itself, complete self
hosting, compile back to JavaScript,
and replace Ruby as the Next Big
Thing in all environments. ”

186. YAPC::NA, 2006

187. YAPC::NA, 2006
“JavaScript will become the common
backend for all dynamic languages,
and so you can write Perl to run in the
browser, on the server, and inside
databases, all with the same set of
development tools. ”

188. YAPC::NA, 2006

189. YAPC::NA, 2006
“Because, as we all know,
worse is better, so the worst
scripting language is doomed
to become the best.”

190. YAPC::NA, 2006
“Because, as we all know,
worse is better, so the worst
scripting language is doomed
to become the best.”
劣=夯

194. JavaScript: Good Part Only

195. CoeeScript: HalfPart Noise
JavaScript: Good the Only
cs = (js) = js/2
Jeremy
Ashkenas

196. CoeeScript: HalfPart Noise
JavaScript: Good the Only
cs = (js) = js/2
Jeremy
Ashkenas

197. CoeeScript: HalfPart Noise
JavaScript: Good the Only
cs = (js) = js/2
“Original JavaScript: 22k LOC.
Ported to CoffeeScript: 5k LOC.
{async, jsdom, zappa, optimist etc}++”
Jeremy
Ashkenas

199. {x,y} = @offset

200. {x,y} = @offset
var _ref = this.offset;

201. {x,y} = @offset
var _ref = this.offset;
var x = _ref.x;

202. {x,y} = @offset
var _ref = this.offset;
var x = _ref.x;
var y = _ref.y;

203. {x,y} = @offset
var _ref = this.offset;
var x = _ref.x;
var y = _ref.y;
js2coffee.org

207. Function::ᵒ = (fun) -

208. Function::ᵒ = (fun) -
(arg) = @ fun arg

209. Function::ᵒ = (fun) -
(arg) = @ fun arg
f = (x) = x * 2

210. Function::ᵒ = (fun) -
(arg) = @ fun arg
f = (x) = x * 2
g = (x) = x * 3

211. Function::ᵒ = (fun) -
(arg) = @ fun arg
f = (x) = x * 2
g = (x) = x * 3
h = f .ᵒ g

212. Function::ᵒ = (fun) -
(arg) = @ fun arg
f = (x) = x * 2
g = (x) = x * 3
h = f .ᵒ g
h 100 # 600

213. Function::ᵒ = (fun) -
(arg) = @ fun arg
f = (x) = x * 2
g = (x) = x * 3
h = f .ᵒ g
h 100 # 600

214. Zappa: Lazy Node.js
zappajs.org

215. Zappa: Lazy Node.js
Maurice
Machado
zappajs.org

216. Zappa: Lazy Node.js
“If you can describe it
in 495 characters,
why on earth should
Maurice
it take 879?”
Machado
zappajs.org

217. require('zappa') -
@view layout: -
html = body = @body
@get '/': - @render 'index'
@view index: - for name, value of {
wiki: Wiki to HTML
html: HTML to Wiki
}
form method: 'post', =
p = textarea {name}
p = input {type: 'submit', value}

218. require('zappa') -
@view layout: -
html = body = @body
@get '/': - @render 'index'
@view index: - for name, value of {
wiki: Wiki to HTML
html: HTML to Wiki
}
form method: 'post', =
p = textarea {name}
p = input {type: 'submit', value}

219. require('zappa') -
@post '/': - -
@view layout:
if @data.wiki? @body
html = body =
@send w2h @data.wiki
@get '/': - @render 'index'
else if @data.html?
@send h2w @data.html
@view index: - for name, value of {
else redirect '/'
wiki: Wiki to HTML
html: HTML to Wiki
}
form method: 'post', =
p = textarea {name}
p = input {type: 'submit', value}

220. COSCUP, 2011

221. COSCUP, 2011

222. COSCUP, 2011
hack

223. hack

224. hack

225. ...

226. COSCUP, 2011
hack

227. hack

228. hack

229. ...

230. EtherCalc Edit Flow

231. EtherCalc Edit Flow
main.coffee
sc.coffee
Socket.io
SocialCalc.js
Express
Node.js
db.coffee EV/libuv
redis.js Zappa

232. EtherCalc Edit Flow
main.coffee
sc.coffee
Socket.io
SocialCalc.js
Express
Node.js
db.coffee EV/libuv
redis.js Zappa
Redis
(optional)

233. EtherCalc Edit Flow
main.coffee
sc.coffee
Socket.io
SocialCalc.js
Express
Node.js
db.coffee EV/libuv player.coffee
redis.js Zappa SocialCalc.js
Redis
(optional)

234. EtherCalc Edit Flow
main.coffee MULTI
sc.coffee
GET snapshot
Socket.io LRANGE log
SocialCalc.js EXEC
Express
Node.js
db.coffee EV/libuv player.coffee
redis.js Zappa SocialCalc.js
Redis
(optional)

235. EtherCalc Edit Flow
main.coffee MULTI
sc.coffee
GET snapshot
Socket.io LRANGE log
SocialCalc.js EXEC
Express
Node.js
db.coffee EV/libuv player.coffee
redis.js Zappa SocialCalc.js
RPUSH log cmd
Redis
(optional)

236. EtherCalc Edit Flow
main.coffee MULTI
sc.coffee
GET snapshot
Socket.io LRANGE log
SocialCalc.js EXEC
Express
Node.js
db.coffee EV/libuv player.coffee
redis.js Zappa SocialCalc.js
RPUSH log cmd
Redis
(optional)

237. EtherCalc Edit Flow
main.coffee MULTI
sc.coffee
GET snapshot
Socket.io LRANGE log
SocialCalc.js EXEC
Express
Node.js
db.coffee EV/libuv player.coffee
redis.js Zappa SocialCalc.js
RPUSH log cmd
Redis
(optional)

238. EtherCalc Edit Flow
main.coffee MULTI
sc.coffee
GET snapshot
Socket.io LRANGE log
SocialCalc.js EXEC
Express
Node.js
db.coffee EV/libuv player.coffee
redis.js Zappa SocialCalc.js
MULTI RPUSH log cmd
Redis DEL log
(optional) SET snapshot snapshot
EXEC

239. Recalc Subscription

240. Recalc Subscription

241. Recalc Subscription

242. Recalc Subscription
ask.log: Foo

243. Recalc Subscription
ask.log: Foo
log: Foo,snapshot,log

244. Recalc Subscription
ask.log: Foo
log: Foo,snapshot,log
execute: set A1
formula Bar!B2

245. Recalc Subscription
ask.log: Foo
log: Foo,snapshot,log
execute: set A1
formula Bar!B2
ask.recalc: Bar

246. Recalc Subscription
ask.log: Foo
log: Foo,snapshot,log
execute: set A1
formula Bar!B2
ask.recalc: Bar
recalc: Bar,snapshot

247. Recalc Subscription
ask.log: Foo
log: Foo,snapshot,log
execute: set A1
formula Bar!B2
ask.recalc: Bar
recalc: Bar,snapshot
recalc: Bar,snapshot

248. PaaS Deployment

249. PaaS Deployment
stackato.yml
app.js

250. PaaS Deployment
stackato.yml
app.js
dotcloud.yml
server.js

251. PaaS Deployment
stackato.yml
app.js
dotcloud.yml
server.js
server.js

252. REST Interface

253. REST Interface
GET /_/page
PUT /_/page

254. REST Interface
GET /_/page POST /_/page
PUT /_/page {command:[…]}

255. REST Interface
GET /_/page POST /_/page
PUT /_/page {command:[…]}
GET /_/page/cells/A1
PUT /_/page/cells/A1
GET /_/page/names/range

256. TODO, 2012

257. TODO, 2012
‣ Chat EtherPad Lite

258. TODO, 2012
‣ Chat EtherPad Lite
‣ Export/Import, Charts

259. TODO, 2012
‣ Chat EtherPad Lite
‣ Export/Import, Charts
‣ Drupal Integration

260. TODO, 2012
‣ Chat EtherPad Lite
‣ Export/Import, Charts
‣ Drupal Integration
‣ Socialtext Integration

261. TODO, 2012
‣ Chat EtherPad Lite
‣ Export/Import, Charts
‣ Drupal Integration
‣ Socialtext Integration
‣ Forks welcome!

262. Thank you!
EtherCalc
Multiplayer
Spreadsheet

263. EtherCalc
The person who associated a work
with this document has dedicated
the work to the Commons by
waiving all of his or her rights to the
work worldwide under copyright law
and all related or neighboring legal
rights he or she had in the work, to
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