Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Keybase Chat - End-to-end encrypted chat built into Keybase
WorkPatterns - The modern manager's toolkit: 1:1s, feedback, & recognition
Crypho - End-to-end-encrypted messaging and file sharing
SlimPlanner - Team scheduling, resource planning, task management