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2. Textfree - Wikipedia

   en.wikipedia.org/wiki/Textfree

   TextFree (formerly called Pinger and sometimes stylized as textfree) is a mobile application and web service that allows users to send and receive text messages, as well as make and receive VoIP phone calls, for free over the internet. The service costs nothing because it is supported by ads, but users have the option of paying for an ad-free ...

3. Jitsi - Wikipedia

   en.wikipedia.org/wiki/Jitsi

   Jitsi Desktop's conference call window on Mac OS X. Jitsi supports multiple operating systems, including Windows as well as Unix-like systems such as Linux, Mac OS X and BSD. The mobile apps can be downloaded on the App Store for iOS and on the Google Play Store and F-droid platform for Android. [7] It also includes: [50] Attended and blind ...

4. Viber - Wikipedia

   en.wikipedia.org/wiki/Viber

   Viber was originally launched as a VoIP application for voice calling. On 31 March 2011, Viber 2.0 was released which added instant messaging (IM) capabilities. [ 83 ] In July 2012 group messaging and an HD Voice engine were added to both Android and iOS applications. [ 84 ]

5. Comparison of cross-platform instant messaging clients

   en.wikipedia.org/wiki/Comparison_of_cross...

   A valid phone number or email address is not required for registration & login. However, the mobile app serves as the primary device, due to the end-to-end encryption architecture. [121] Yes No No No Trillian: No Yes No No Yes Viber: Phone number No No No No WeChat: Phone number or QQ number No No No No No WhatsApp: Phone number No Yes No No No ...

6. FreeSWITCH - Wikipedia

   en.wikipedia.org/wiki/FreeSWITCH

   FreeSWITCH is a free and open-source telephony software for real-time communication protocols using audio, video, text and other forms of media. The software has applications in WebRTC, voice over Internet Protocol (VoIP), video transcoding, Multipoint Control Unit (MCU) functionality and supports Session Initiation Protocol (SIP) features.

7. Imo.im - Wikipedia

   en.wikipedia.org/wiki/Imo.im

   imo is a proprietary audio/video calling and instant messaging software service. [1] [2] It allows sending music, video, PDFs and other files, along with various free stickers.[3] [4] It supports encrypted group video and voice calls with up to 20 participants.