Nifty - Manage projects, work, and communications in one place.
Tability - Get your goals out of spreadsheets
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.
ConectoHub - If Asana had a powerful OKR system
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.
Ricotta Trivia - Engage your remote team with some Trivia and Icebreakers on Slack. Run a quiz on Slack, answer Icebreaker questions or play games such as This or That, Two truths and a lie and more.