Cryptgeon - Securely share self-destructing notes
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BURN.link - Send secure, encrypted, self-destructing messages
Slackin - Create your own public Slack chat community
Burner Note - Burner Note is a free, ad-free and open sourced service for sending secure text based notes that are completely erased from existence once they've been read.
Chats.Directory - A curated list of the best Slack groups for professionals