Keybase Chat - End-to-end encrypted chat built into Keybase
Secure Send - Securely send passwords or sensitive data
Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.
FusionAuth - FusionAuth is a CIAM platform that is 100% free for unlimited users.
Crypho - End-to-end-encrypted messaging and file sharing
secure-ls - Secure localStorage data with encryption and compression