Voip Stunt is described as 'VoipStunt is a free program that uses the latest technology to bring free and high-quality voice communications to people all over the world' and is an app in the Social & Communications category. There are more than 25 alternatives to Voip Stunt for a variety of platforms, including Android, Online / Web-based, iPhone, Windows and Mac. The best alternative is Jitsi, which is both free and Open Source. Other great apps like Voip Stunt are Wire (Free Personal, Open Source), WhatsApp (Free), Hangouts (Free) and Zulip (Free Personal, Open Source).
Jitsi (previously SIP Communicator) is an audio/video and chat communicator with full encryption that supports protocols such as SIP, XMPP/Jabber, ICQ/AIM, Windows Live, Yahoo!, GTalk/Hangouts extensions, as well as OTR, ZRTP, etc.
Wire is the most secure collaboration platform featuring messenger, voice, video, conference calls, file-sharing, and external collaboration –all protected by the most secure end-to-end-encryption. Why Wire?
WhatsApp is an iPhone and Android messaging app which allows you to exchange messages without having to pay for SMS. In addition to basic messaging WhatsApp users can create groups, send each other unlimited images, video and audio media messages.
LINE is a Japanese proprietary application for instant messaging on smartphones and PCs. Line users exchange text messages, graphics, video and audio media, make free VoIP calls, and hold free audio or video conferences.