Sqlite :- http://www.sqlite.org/ public domain embeddable sql library with a lot of language bindings. Apple shall be shipping this along with Tiger http://www.apple.com/macosx/tiger/unix.html Useful when you want a something more than BerkeleyDB but don't want the install/config of mysql and postgresql. Libevent: http://www.monkey.org/~provos/libevent/ Event notification library which is also available in NetBSD and OpenBSD. Allows applications to be portable and use the most scalable event notification mechanism on each platform (kqueue for *BSD and epoll for Linux) Regards, Yusuf