Apps like Mattermost Classic

Here are some great alternatives to Mattermost Classic by Mattermost :
Zulip
Zulip
★3.6
Munin for Android
Munin for Android
★4.3
Simple HTTP Server
Simple HTTP Server
★4.2
IMBox.me - Work messaging
IMBox.me - Work messaging
★3.4
CloudWeb - File & Web Server
CloudWeb - File & Web Server
★3.8
Anonymous Messenger
Anonymous Messenger
★3.9
Nextcloud Talk
Nextcloud Talk
★4.1
Fedilab
Fedilab
★4.5
Element - Secure Messenger
Element - Secure Messenger
★3.3
ArmorText
ArmorText
★4.4
CudaLaunch
CudaLaunch
★3.3
Pumble — Team Communication
Pumble — Team Communication
★4.3
TeamSpeak 3 - Voice Chat
TeamSpeak 3 - Voice Chat
★3.2
Google Chat
Google Chat
★4.4
Chatstack
Chatstack
★3.3
Android Proxy Server Pro
Android Proxy Server Pro
★4.6