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.

Huminos - Free OKR and Growth acceleration platform for Startups

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.

Workbot for Slack - Work your apps from Slack

Basecamp - A simple and elegant project management system.

Kyber for Slack - All-in-one Slack app: tasks, standups, polls, surveys & more