Linphone - Linphone is an internet phone or Voice Over IP phone (VoIP).
Digify - Secure yet simple to use, Digify is the easiest way to track and protect confidential and...
Zoiper - Cross-platform VoIP softphone dialer for SIP and IAX systems
Drooms - Virtual data room software
Sipdroid - Free and open-source SIP/VoIP Client
Datasite Diligence - Datasite Diligence is the fastest-growing virtual data room software that is efficient and highly secure.