Starfiles - File hosting done simple
Tragofone - White-label VoIP Softphone with WebRTC and Auto-provisioning
Plover - Browser Airdrop - transfer files to anyone, any device
PhonerLite - PhonerLite enables your PC to use it for internet telephony (VoIP , Voice over IP, SIP).
instashare - Share your photos to instagram from your mac
tSIP - tomeko.net/software: SIP client for Windows.