available in debian, SUSE, but the version in debian stable is rather old. Debian testing has version 1.3e, which is usable
support dev/poll, kqueue(2), select(2), poll(2) and epoll(4). It also has experimental support for real-time signals.
BSD without advertising clause
plenty of communication on user list, already three minor releases in 2008
doxygen documentation available, but not that extensive, example applications available
performance benchmarks available, even if there are some forks that claim a somewhat better performance
used from 20 applications, for example Tor, MySQL (in 6.0)
should compile on Linux, *BSD, Mac
OS X, Solaris and Windows
also support asynchronous
DNS with an own resolver
support the usage of custom logging functions