Business Model Kit - Explore revenue models to make money with your idea
CNVS - Create lean, feature or biz model canvases for free
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.
Streamtime - Project & task management for creative teams and businesses
productboard - Beautiful and powerful product management.
Idealist - Volunteer, work, and intern job search