Frank Celler discusses using the Ruby-based scripting language mruby as an embedded language in the AvocadoDB nosql database. He explains that AvocadoDB offers unique features and solves some problems of other nosql databases. The mruby subproject allows using Ruby scripts for stored procedures, as an alternative to JavaScript, and provides access to AvocadoDB's graph functions. He invites interested developers to get involved with the AvocadoDB project.