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.
Makerlog - Makerlog is the dead-simple task log that helps you stay productive and ship faster.
Curious - 15,000 lessons in tech, biz, DIY and more. Grow your skills.
WIP.co - Work in progress. We are a community of makers who help each other ship product.
Hygger - Hygger - is an Agile project management tool with built-in prioritization.
Indie Hackers - Connect with fellow entrepreneurs, developers, and bootstrappers who are sharing the strategies and revenue numbers behind their companies.