Currently, there is not a server side edition of CIAO! server that runs on Linux. However, you may still utilize CIAO! on the development clients to capture version history and development activity. The key differences being that you will not have the server side features. i.e. one example is that CIAO! server would normally lock an element once a designer client checks it out. This would stop other developers from making changes who don't have CIAO client installed.
If you choose to only use CIAO! client. You may also store the CIAO! log and configuration control NSFs on a linux based server.