Proof.ink - Proven immutable data stored on the Steem blockchain
Seald - Keep your conversations secure, everywhere.
Immutable.js - Immutable persistent data collections for Javascript which increase efficiency and simplicity. - immutable-js/immutable-js
Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.
DataTip - The fastest way to store & access your critical datapoints.
Crypho - End-to-end-encrypted messaging and file sharing