Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.
Set in Block - Blockchain-based permanent message creator and reader
Keybase Chat - End-to-end encrypted chat built into Keybase
CryptoKitties - Breed and collect adorable creatures using Ethereum
Crypho - End-to-end-encrypted messaging and file sharing
Ethereum Gas Monitor - Ethereum Gas Monitor is a mac menu bar app that displays gas prices for fast, average and safe slow ethereum transactions.