Diigo is a free social bookmarking and knowledge sharing tool that allows users to collect and organize web bookmarks, articles, and other resources. It can be used to share sources with peers and compare research notes through concept mapping. Google Drawings is an online whiteboarding tool designed for collaboration, brainstorming, asking questions, and sorting ideas.

2.  Diigo
can also be used to share
sources when discussing with your
peers the findings of your research
or even when simply comparing
notes.

3.  Concept
mapping is putting all the
ideas or sources together into one
nap to see how these ideas interrelate with one another.

4.  Is
a service that provides an online
whiteboard space that you can use
to share
drawings,documents,spreadsheets,
and more.

5.  Is
designed with elementary school
students in mind.It can be useful for
hosting collaborative brainstorming
sessions,asking questions,and sorting
ideas.

6.  Is
a free social
bookmarking,research,and
knowledge sharing tool created to
mimicthe ease of taking notes while
providing a network for sharing and
discovering information.

7.  Is
a slide show sharing site similar to
slide share or slide boom with a couple
of added features.Just as on slide
share and slide boom users can upload
and share slide show presentations
privately or publicly.