shroudBNC is a modular IRC proxy written in C++. It is capable of proxying IRC connections for multiple users. Using TCL scripts, it can be extended.
The Goblin and the Butterfly (TGATB) is a 2D/3D client for the MMORPG of the same name.
SLiteChat is an in-world text-only local
chat/instant messaging client for Second Life.
Features include friends list management
(accept/reject friending requests), local chat,
and instant messages.
twitter-cmdline is a commandline twitter client
that implements both
reading and writing to your twitter stream. It is
written in Perl and
only requires LWP::UserAgent be installed.
A relational and transaction-based database system.
A Web server with an in-built data store.