Kotoba is very much a work-in-progress Japanese vocabulary system for students learning Japanese. While there are a lot of other pieces of software out there for studying foreign languages, even specifically Japanese, none of them are, in my opinion, functionally complete.
This project encompasses my own years of studying Japanese, incorporating approaches and techniques that I have found useful. At present I am targeting myself as the sole user; however, as time progresses I hope to include community-based features.
Please do not hesitate to contact me if you have any suggestions or ideas.