Dive - Social space for remote teams
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.
Indie Hackers - Connect with fellow entrepreneurs, developers, and bootstrappers who are sharing the strategies and revenue numbers behind their companies.
Curious - 15,000 lessons in tech, biz, DIY and more. Grow your skills.
Plutoview - Shared browsing solution for remote group collaboration
Nomad House - Houses around the world for nomads to live and work together