libevent

Name Category Description
bitcoin-qt net-p2p An end-user Qt GUI for the Bitcoin crypto-currency
bitlbee net-im irc to IM gateway that support multiple IM protocols
getdns net-dns Modern asynchronous DNS API
groonga app-text An Embeddable Fulltext Search Engine
libmemcached dev-libs a C client library to the memcached server
libverto dev-libs Main event loop abstraction library
libwebsockets net-libs A flexible pure-C library for implementing network protocols
links www-client A fast and lightweight web browser running in both graphics and text mode
nsd net-dns An authoritative only, high performance, open source name server
onion net-libs C library to create simple HTTP servers and Web Applications
prosody net-im Prosody is a flexible communications server for Jabber/XMPP written in Lua

Thank you!