OneNote - Get the OneNote app for free on your tablet, phone, and computer, so you can capture your ideas and to-do lists in one place wherever you are. Or try OneNote with Office for free.
Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
Bigtent - BigTent is a web-based organization and communication portal for groups.
Better Notes - Simple notes app that ties notes together with #hashtags
Nabble - Nabble is a forum software that are embeddable and fully customizable with scripting language.