Basefolder - Use your home PC as your own personal cloud storage server.
Tragofone - White-label VoIP Softphone with WebRTC and Auto-provisioning
SIXA - Personal cloud computer, built for developers
PhonerLite - PhonerLite enables your PC to use it for internet telephony (VoIP , Voice over IP, SIP).
MiMedia - The personal cloud you've always wanted
tSIP - tomeko.net/software: SIP client for Windows.