A CMDB is the first stone of a complex structure you are building, so don't look at it as a standalone piece, but as the keystone all your future processes will rely on.
Some leads to choose an ITIL ready, or evolutive, or open-source CMDB :
- OTRS (the number one is this list had to be an opensource)
- EverDream (a DELL product)
- SiteHelpDesk-IT (with some 17799 compliance)
- Tracker Suite for IT
- Parature Help Desk
- Computer Associates Unicenter ServiceDesk
- Symantec Altiris Asset Management & CMBD
