A nonprofit service with moderate monthly fees and strong customization support. Online campaigns, donations, event registration, mail blasting, and basic member tracking.
Flexible open-source content management and blogging software with an active user and developer community and a wide variety of plug-ins or extensions available.
Site indexing application with yahoo like categories and google-like search - this version focuses on mostly nonprofit capacity resources primarily in the US but also in Canada, UK, A/NZ
Full-featured open source office productivity suite, featuring word processor, spreadsheet, presentation, drawing and database packages; free MS Office replacement.
Upcoming.org is a social event calendar, completely driven by people like you. Manage your events, share events with friends and family, and syndicate your calendar to your own site.
The Social Source Commons is a “knowledge commons” that provides users with: a directory of software applications; links to relevant documentation, localization tools, services, user reviews; and a place to request tools/features.
Independent publishing marketplace for digital do-it-yourselfers. You can publish, sell and buy books, music, comics, photographs, movies, etc. For example, you can upload a PDF and sell it in book form at whatever price you specify.