Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
Askneo.io - Personalize sales at scale and skyrocket returns.
Olvid - The most secure messaging app in the world.
Norby.live - The easiest way to collect signups and send SMS campaigns
WireMin - WireMin is a private messaging tool for your most personal communications.
Textedly - Textedly is an SMS marketing communications channel that allows to advertise, promote, announce, and engage with audience through text messaging directly to cell phones.