There is RapidCP:
http://www.rapidcp.org/http://demo.rapidcp.org/User: demo
Pass: demo
Download RapidCP V3 Beta
http://sourceforge.net/projects/rapidcp/Seems that RapidCP may only be for *nix flavored servers.
Used to go under the name of ZPanel till there was a rift.
ZPanel may be for Windows flavored Apache servers.
Read this:
http://www.zpanel.co.uk/historyNow ZPanel may well have overtaken RapidCP and their web site seems to be more user friendly - less spam in their forum:
http://www.zpanel.co.uk/Download:
http://www.zpanel.co.uk/downloadI have trialled ZPanel some time ago (v2) and found it to be quite useful for it's intended purpose and far cheaper than it's big brother cPanel - you may only need v3 for your needs.
Google for 'rapidcp' and 'zpanel' for more info and links.