VoIPstudio is an award-winning VoIP system that offers businesses of all sizes a scalable communication solution. It’s inexpensive, easy-to-use, offers a full suite of PBX features, and is fully integrated for CRM.
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Freetone
TextNow
Dingtone
TextMe
Talkatone
Fongo
Nextplus
textPlus
Olvid
FluffyChat
Signal
Molly (Signal fork)
TeleGuard
NYNJA
Mi Airit
aTalk
FreetoneTextNow - TextNow is a mobile virtual network operator (MVNO) that provides a free phone service to users by using other cellular networks coverage.
FluffyChat - Open. Nonprofit. Cute ?
Dingtone - Dingtone is a free call and texting application for making unlimited calls and text messages to any number at the moment registered in any part of the world by any cellular company.
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
TextMe - TextMe is a free calls and messaging application at both local and international levels.
Molly (Signal fork) - Molly is an independent Signal fork for Android