Hi @sharmasatya ,
We do not currently offer prebuilt adapters for Siebel CRM. However, our community platform offers robust APIs as well as a production example of CRM integration to salesforce.com that leverages those APIs. We could certainly use that model as a starting point for integration into Siebel.
For what it's worth, I have built CRM integrations to a number of systems (including siebel) at my prior company. It is a particular interest area of mine so I'm happy to help. It is also within my area of responsibility as I'm the SE that supports our partners and global alliances.