Amsn
A MSN Messenger clone for Linux. FAQ, software download, translation resource and Spanish site translation. (Tcl/Tk) [Linux, Windows, Macintosh]

Babylon
A client-server whiteboard/chat program which can be imbedded in WWW documents as an applet, or run as a standalone application. (Java)

BitlBee: An IRC to IM chatting gateway
An console-based IRC to IM chatting gateway, including ICQ/MSN/Jabber. (C) [Unix]

BrowseX
A lightweight web browser for Windows or Linux with support for embedded Tcl scripts. (C, Tcl) [Artistic]

Cervisia
A graphical frontend to CVS. (C++) [GNU/Linux, Unix]

Curl and Libcurl
A tool and a library (usable from many languages) for client-side URL transfers, supporting FTP, FTPS, HTTP, HTTPS, GOPHER, TELNET, DICT, FILE and LDAP. (C) [GNU/Linux, Unix, Windows, VMS, RISC OS, OS/2]

CvsGraph
A utility for generation of graphical representation of revisions and branches from a CVS/RCS repository. (C) [GNU/Linux, Unix]

Dailystrips
A utility to download your favorite online comic strips each day. (Perl)

Fetch
A simple HTTP download tool, and corresponding library. (C) [GNU/Linux, Unix]

Irssi
Modular realtime chat client supporting IRC and SILC protocols. Supports multiple servers, themes, perl scripting and plugins. (C) [GNU/Linux, Windows]

Lyntin
An extensible Mud client and framework for the creation of autonomous agents, or bots, as well as mudding in general. (Python)

Muse Communications API
A Java API with the goal of integrating all network-collaboration services into one. (Java)

NetSender
An instant messaging system for Microsoft networks. (Visual Basic) [Windows NT/2000/XP]