Adns: A DNS resolver library for C and C++ programs, and a collection of useful DNS resolver utilities. (C) [GNU/Linux, Unix]
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: Tunnels instant messaging traffic (including MSN, ICQ, Yahoo, Jabber) to a virtual IRC channel and virtual IRC queries. Documentation, screenshots, bug tracking, and downloads.
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]