Found very good site: steve.org.uk

Some interesting stuff:

• Argo — Xen Monitor / Control Panel. Simple, extensible, framework for controling a host running multiple Xen instances. Exactly what I need for the company.
• lua-httpd — simple, but pretty good Lua http server. Even have support for vhosts!
• Fortress — a simple script-based security scanner. C++ code, but tests should be written in Lua.

Steve Kemp have also very interesting weblog .