Shapr - A completely free way to build your professional network.

Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.

Wildcard - Discover, connect and meet people at communities

Eventbrite - Discover Great Events or Create Your Own & Sell Tickets

Genuin Relationships - Genuin conversations lead to genuine relations

Bigtent - BigTent is a web-based organization and communication portal for groups.