Twisted is an event-based framework for Internet applications. It includes a Web server, an SMTP/POP3 server, a telnet server, an SSH server, an IRC server, a DNS server, a generic client/server pair for remote object access (Perspective Broker), and APIs for creating new protocols. It supports integration with GTK+, GTK+ 2, Qt, Tkinter, wxPython, Mac OS X (PyObjC) and Win32 event loops. It also supports TCP, SSL and TLS, UDP, Unix sockets, multicast, and serial ports. Supported protocols include HTTP, FTP, SMTP, POP3, IMAP, TOC, OSCAR (AIM and ICQ), SSH, DNS, IRC, NNTP, Jabber, SOCKSv4, Telnet, SIP (for VoIP), and XML-RPC and SOAP using external packages. Most protocols are supported as both servers and clients.
Fljud (the Flexible LDAP Jabber User Directory) is a JUD that uses an LDAP directory for user information. You may find it to be very useful if you already have a Jabber server using LDAP for account authentication and vcards. It can replace your existing JUD, or can be quickly adapted to present and edit other information from your LDAP directory using Jabber.
colloquy is an Internet talker server. It lets people all around the world talk to each other in real time. It is inspired by The Nilex Talker and Egham Hills, a popular "technical" talker in the UK. It is explicitly designed not to have "socials" and "custom rooms" and other bloat that just gets in the way of idle chat like many other talker servers.
Lisppaste is a fully-featured pastebot that provides a Web interface to submit pastes, and announces the URL the paste is stored at to a channel of your choice. It features multiple channel support, paste annotation support, persistent pastes, a Web interface to the list of pastes in the system, RSS support in short and full varieties, XML-RPC support, and direct linking to meme IRC logs.