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.
Butter - Butter is a newly launched chatting application that focuses more on the privacy of its users.
WorkPatterns - The modern manager's toolkit: 1:1s, feedback, & recognition
Mapped - Mobile app that makes your startup journey easier.
SlimPlanner - Team scheduling, resource planning, task management
Kwayet - Team chat & collaboration app, a simple way to Slack