pidgin privacy please is a pidgin plugin to stop spammers from annoying you. You can block messages from certain users, block messages from people who are not on your contact list, and suppress repeated authorization requests. Optionally, senders of blocked messages can be notified with an auto-reply.
SurrealServices is a full replacement IRC Services package providing NickServ, ChanServ, BotServ, MemoServ, and OperServ, as well as LogServ and ConnectServ. Features are loosely based on ConferenceRoom/Auspice and Anope, as well as NeoStats. Some security features are also available such as a TOR (http://tor.eff.org/) detector/banner and a country detector (which checks IP allocation and optionally bans). It is multithreaded to eliminate lag due to the asynchronous nature of MySQL and DNS lookups.
Sofia-SIP is a SIP user agent library, compliant with the IETF RFC3261 specification. It can be used as a building block for SIP client software for uses such as VoIP, IM, and many other real-time and person-to-person communication services. The primary target platform is GNU/Linux. Sofia-SIP is based on a SIP stack developed at the Nokia Research Center.
BitchX is the premiere IRC (Internet Relay Chat) client. It originally was a modified version of the popular ircII client, and the features were eventually merged into the EPIC IRC client. The current development is aimed at merging the client back to a current branch of EPIC and bringing compatibility and stability back to the client, while bringing the features that are BitchX into a new client.
ircproxy is an Internet Relay Chat Proxy, which works as a layer between your IRC client and the IRC server. It features bouncer capability and has more features, flexibility, and configuration options than other tools. It also includes an option to use the system password list instead of requiring a separate password database.