Meta Search - Search your Desktop, Google Drive, Dropbox, Gmail, Evernote.
Tragofone - White-label VoIP Softphone with WebRTC and Auto-provisioning
Findo - Your smart search 🔍 assistant across personal cloud ☁️
PhonerLite - PhonerLite enables your PC to use it for internet telephony (VoIP , Voice over IP, SIP).
FYI - Find your documents, like magic 🔮
tSIP - tomeko.net/software: SIP client for Windows.