Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.
Suntimes - Android app (and widget collection) that displays sunlight and moonlight times for a given location.
Bigtent - BigTent is a web-based organization and communication portal for groups.
SunCalc - Find out where the sun will be at any time in any location
Nabble - Nabble is a forum software that are embeddable and fully customizable with scripting language.
Sol: Sun Clock - Get reminded when it's sunrise or sunset, wherever you travel!