TiddlyWiki - a non-linear personal web notebook
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.
wikidPad - wikidPad is an application for storing thoughts, ideas, todo lists, contacts, or anything else that user can think of to write down.
Wrike - Wrike is a flexible, scalable, and easy-to-use collaborative work management software that helps high-performance teams organize and accomplish their work. Try it now.
Knowledge Workshop - Learning Management Solutions provides innovative and reliable software for the knowledge worker.
Basecamp - A simple and elegant project management system.