Hosting git repositories -- Gitolite allows you to setup git hosting on a central server, with very fine-grained access control and many (many!) more powerful features.

ExifTool meta information reader/writer

A terminal for iOS, with multiple windows

Remote Virtual Desktops Manager

Qwerty keyboard layout with French accents

A tool for checking backward API/ABI compatibility of a Java library

A static tumblelog generator available as both a Perl and Python version