doo - A smart, simple app for reminders and to-dos
Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.
Purp - A smart to-do list and goal tracker app
Bigtent - BigTent is a web-based organization and communication portal for groups.
Gone - An ephemeral to-do list
Nabble - Nabble is a forum software that are embeddable and fully customizable with scripting language.