CloneRNX is a simple and funny game. It was cloned from the popular Facebook application called ChainRNX. While the original version of the game is a Flash application and it can be executed only within a Facebook account, CloneRNX is a Java desktop application that can be launched on any desktop system.
garith is a game similar in spirit to BSD's "arithmetic" or TuxMath. The game asks you to perform a simple arithmetic operation within a certain time frame. It improves your skills by stressing the operations you get more frequently wrong or that longer to answer. The statistics are saved/restored across games, so that each game is tuned for your current arithmetic abilities.