Seald - Keep your conversations secure, everywhere.
TextNow - TextNow is a mobile virtual network operator (MVNO) that provides a free phone service to users by using other cellular networks coverage.
Crypho - End-to-end-encrypted messaging and file sharing
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.
Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.
TextMe - TextMe is a free calls and messaging application at both local and international levels.