Basecamp is a unique project collaboration tool. Projects don't fail from a lack of charts, graphs, or reports, they fail from a lack of communication and collaboration. Basecamp makes it simple to communicate and collaborate on projects. It's elegant, easy, and web-based. You don't need to download, install, or configure anything (no IT department required!). All you need is a web browser and an internet connection.

HipCal is a free online web service which features a free web calendar service that handles your appointments, contacts, and to-do lists in one simple interface.

Stikkit makes organizing your daily details as simple as jotting down a note or firing off email. Stikkit's "little yellow notes that think" talk to the productivity applications you already use, as well as to friends, coworkers and family, giving you a universal remote for your life.

Thirty-Seven Signals offers web-based software for simple to-do lists and project management.