Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.
Partle - Revolutionizing the way people get together
Bigtent - BigTent is a web-based organization and communication portal for groups.
Velcome - Get Price quotations for tour activities in Zanzibar delivered to your inbox in minutes
Nabble - Nabble is a forum software that are embeddable and fully customizable with scripting language.