Apps like Thunderbolt by Spaceship

Here are some great alternatives to Thunderbolt by Spaceship by Namecheap, Inc :
Glacier Chat: Secure Messenger
Glacier Chat: Secure Messenger
★4.3
Chatwork - Business Chat App
Chatwork - Business Chat App
★3.4
Mejhool: Decentralised
Mejhool: Decentralised
★3.9
Spike - Email & Team Chat
Spike - Email & Team Chat
★4.4
AWS Wickr
AWS Wickr
★4.0
Cymbus (Legacy)
Cymbus (Legacy)
★4.3
Comera - Video Calls & Chat
Comera - Video Calls & Chat
★4.3
Skred Messenger
Skred Messenger
★4.0
Element - Secure Messenger
Element - Secure Messenger
★3.3
Teamwire - Business Messenger
Teamwire - Business Messenger
★3.9
Circuit by Unify
Circuit by Unify
★3.3
Nextcloud Talk
Nextcloud Talk
★4.1
Jami
Jami
★3.7
Buzz: Secure Medical Messenger
Buzz: Secure Medical Messenger
★4.7
EonNet Community
EonNet Community
★4.8
SL2™ for Microsoft Intune
SL2™ for Microsoft Intune
★4.8