Donorhut - Donorhut offers cloud fundraising software for charities and non-profits of any size.
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Txt2Give - Txt2Give helps churches, non-profits, schools, alumni associations, and political campaigns receive donations with text messages.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Little Green Light - Illuminating Data. Advancing Nonprofits.
Bigtent - BigTent is a web-based organization and communication portal for groups.