Apps similar to ProCall include Linphone, which is free and open source. Other options are PhonerLite and SessionTalk SIP Softphone. In total there are three Video Calling Apps like ProCall for Windows, Android, iPhone, iPad and Linux.
Linphone is one of the most famous open source softphones in the world. It is fully SIP-based, for all calling, presence and IM features.
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PhonerLite enables your PC to use it for internet telephony (VoIP , Voice over IP, SIP). You need an internet connection and an account from a provider supporting the SIP protocol.
With a superbly designed and intuitive user interface, the softphone offers easy set up with lots of preconfigured VoIP providers built in and smart call management features. Enjoy high quality enterprise communication features with zero effect on battery life.
United Kingdom
