Weekdone - Market leader and innovator since 2013. Set structured quarterly goals, keep track of activities, and focus on getting real business results. Track weekly progress, provide feedback, and move everyone in a unified direction.
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.
Perdoo - OKR methodology, software and coaching
Curious - 15,000 lessons in tech, biz, DIY and more. Grow your skills.
Quantive - The best platform for turning strategy into results.
Indie Hackers - Connect with fellow entrepreneurs, developers, and bootstrappers who are sharing the strategies and revenue numbers behind their companies.