Apps like Threema. The Secure Messenger

Here are some great alternatives to Threema. The Secure Messenger by Threema GmbH :
Session - Private Messenger
Session - Private Messenger
★3.8
Confide - secure messenger
Confide - secure messenger
★4.4
Element - Secure Messenger
Element - Secure Messenger
★3.4
Zangi Private Messenger
Zangi Private Messenger
★4.3
ADAMANT Messenger
ADAMANT Messenger
★4.2
Delta Chat
Delta Chat
★4.2
BChat - Web3 Secure Messenger
BChat - Web3 Secure Messenger
★4.1
MilChat
MilChat
★3.6
Glacier Chat: Secure Messenger
Glacier Chat: Secure Messenger
★4.3
Pryvate Messenger
Pryvate Messenger
★3.6
get2Clouds Priv. Communicator
get2Clouds Priv. Communicator
★4.1
BrightChat - Secure Messaging
BrightChat - Secure Messaging
★4.4
Handcent Next SMS messenger
Handcent Next SMS messenger
★4.5
Troop Messenger
Troop Messenger
★3.5
Gap Messenger
Gap Messenger
★3.6
StealthTalk: Private Messenger
StealthTalk: Private Messenger
★4.1