Slack competitors

More Asynchronous Communication based ones:

• Basecamp
• Twist
• Microsoft teams
• Quill Chat
• Zulip
• Knovigator
• HEY / email

Ones that are focused on being open source or decentralized:

• Element Chat
• Rocket Chat

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Backlinks:

• People Crippling Group Chat
• Power of a Title
• Remote Companies end up building a Async Communicaiton tools
• Slack MOC