Keybase Chat - End-to-end encrypted chat built into Keybase
21 Lists - Send and receive targeted, paid microtasks
Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.
Bitbounce - Charge unsolicited email senders a cryptocurrency fee
Seald - Keep your conversations secure, everywhere.
BitcoinGet - Earn bitcoin by completing tasks, answering surveys, watching videos, and more.