Threema. The Secure Messenger

SkyPhone - Voice & Video Calls

Inbox Private Messenger

Nuki Smart Lock

VSee Messenger

Text Vault - Texting App

Talkyto - Twilio calls & SMS

ClickMeeting Webinar App

Free Conference Call

Handcent Next SMS messenger

RAYNET CRM

Hiya: Spam Blocker & Caller ID

Multi SMS Sender (MSS)

Groundwire: VoIP SIP Softphone

Envoy

textPlus: Text Message + Call

OnPhone - Second Phone Number

Wire - Secure Messenger