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.
Cuba - Cuba is a Ruby microframework for web development.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Ramaze - Ramaze is a very simple and straight-forward web-framework.
Slack - A messaging app for teams who see through the Earth!
NYNY - A (ridiculously) small and powerful web framework.