A DSL that ease (shortens) the set up mockito based unit tests
Web development IDE in browser, supports Java, ruby, javascript...etc
a massive irc bot
speed reading tool
Blogging system based on JSR 170 / 283 (Java Content Repository).
High volume bulk mailer
The Guardian DotCom
Solver for Math Text Problems
research on rules for conflict behaviour for ants
Eclipse integration for Isabelle proof assistant
A quantum circuit simulator written in Scala
A CBLS Engine in SCALA, NOW part of OscaR
Framework for creating eventually-consistent distributed datastores
Neural network based on signal delays.