TeamTalk.io is described as 'TeamTalk provides 1 - click meetings, audio -video calling, screen sharing, audio recording, meeting notes, whiteboard, Google calendar, text chat, file sharing and more. Now Downloads or Installs required. Signup for Free now' and is an app in the Remote Work & Education category. There are more than 100 alternatives to TeamTalk.io for a variety of platforms, including Android, iPhone, Online / Web-based, Windows and iPad. The best alternative is Telegram, which is free. Other great apps like TeamTalk.io are Signal (Free, Open Source), Element (Free Personal, Open Source), Discord (Freemium) and Jitsi (Free, Open Source).
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.
Jami (formerly GNU Ring, SFLphone) positions itself as a potential free Skype replacement Open Source and cross-platform. Jami gives you a full control over your communications and an unmatched level of privacy.
Mumble was the first and is the most successful and wide spread free and open source software for VoIP. It was the first VoIP software to provide low-latency audio suitable for gaming, and at the same time was a pioneer in high audio quality at the same time.
With Viber, everyone in the world can connect. Freely. More than 460 million Viber users text, make HD-quality phone and video calls, and send photo and video messages worldwide over WiFi or 3G - for free.