There are no current plans to update Renshuu (but who knows).
You enter into the program a list of kanji which you'd like to practice, and associated vocabulary words. (A basic selection is included.)
When practicing, the program shows you a word with missing kanji. You are asked to draw the kanji in question.
Renshuu keeps track of your progress and indicates when it's time to practice a particular set again.
The program is free and runs on Mac, Windows, and (probably) Linux. (A manual is included in PDF format.)