PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.
SQLite - SQLite Home Page
Keybase Chat - End-to-end encrypted chat built into Keybase
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.
Crypho - End-to-end-encrypted messaging and file sharing