Python Director

Python Director - pure Python tcp load balancer.

admin interface

Features:

async i/o based, so much less overhead than fork/thread based balancers. Can use either twisted or python's standard asyncore library (twisted is recommended, and asyncore support will be removed in a future version).
Multiple scheduling algorithms (random, round robin, leastconns, leastconns+roundrobin)
If a server fails to answer, it's removed from the pool - the client that failed to connect gets transparently failed over to a new host.
xml based configuration file (see a sample)
seperate management thread that periodically re-adds failed hosts if they've come back up.
optional builtin webserver for admin (sample of the running screen)
webserver has methods suitable for both interactive and automated systems