MHonArc provides HTML mail archiving with index, mail thread linking,
etc; plus other capabilities including support for MIME and powerful
user customization features.

PySol is a solitaire card game. Its features include support for 20
different games, very nice look and feel, multiple cardsets and
backgrounds, unlimited undo & redo, load & save games, player
statistics, hint system, demo games, support for user written plug-ins,
integrated HTML help browser, and it's free Open Source software.