Mindbender is a game which works like Mastermind, but is easier to use. Instead of colors, you use numbers from 1-9. It's a four-digit code you have to solve, as in Mastermind. You can set the number of tries in a separate file or you can use a small setup manager. It's a very small project.
jOpenTTDLib is a Java library that polls OpenTTD servers for statistics on games in progress. This includes data on the map and how all the companies are faring. On top of this functionality, the games can be continually polled and game events are generated and listeners notified.
Whiteshoe is a text-based shooter game in which you explore a changing maze and complete your goals before the other players complete theirs or find you. It is based on the old game hunt, but was totally rewritten from scratch to use TCP packets and be more modular and expandable in design.