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.
Freedcamp - Our mission is to empower people to achieve great things together. The notion of simple collaboration has been lost and split into hundreds of fragments with countless tools trying to solve each piece.
WIP.co - Work in progress. We are a community of makers who help each other ship product.
Zenkit - Zenkit is the home you always wanted for your ideas, your projects, your business.
Indie Hackers - Connect with fellow entrepreneurs, developers, and bootstrappers who are sharing the strategies and revenue numbers behind their companies.