Basecamp is a project management and collaboration tool that allows groups of people to share files, meet deadlines, assign tasks, and give feedback. The software is web-based an can be accessed from any device and anywhere as long as device has a web browser.
Basecamp has a fixed price of $99 per month and $999 per year, which includes unlimited projects and users.
Free Trials are available if you want to test the application before making a purchasing decision.
Basecamp is also available free of charge for students, teachers, charities and various non-profit organizations (contact basecamp support for further details).