C++
Common Code - Assorted useful classes.
C#
Chatter - Windows Forms IRC client. Uses NetIRC and NetIdent.
Illusory Patcher Client - Software update library. Easy to integrate.
Japanese/Kanji Dictionary - JMDICT/KANJIDIC2 parser and Windows Forms Kanji control.
MySettings - Entirely .Net-native INI file reader/writer.
NetIRC and NetIdent - IRC client and Ident server library.
Voting Systems - Approval, Borda, Condorcet, Instant Runoff, and Plurality voting classes.
Microsoft Access
Kanji Study Booklet Maker - Simple Microsoft Access template for making Kanji study booklets.