TidyHQ - Organization management tool to support membership, subscriptions, event planning, and outreach.

Design Principles - An open source repository of design principles and methods

Galette - Galette is a membership management web application towards non profit organizations.

Facebook Design Resources - A collection of free resources made by designers at Facebook

Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.

Facebook - Connect with friends, family and other people you know. Share photos and videos, send messages and get updates.