Open Social is an open source community building solution. We're a great match for your external, volunteer and ideation community. Our software is used by NGOs, governments and hundreds of smaller organizations to connect with their members, volunteers, employees, and customers. Greenpeace Greenwire, an award-winning project with hundreds of thousands of volunteers worldwide, was the inspiration for Open Social. We are now a Drupal-based community solution with more than a thousand active installations.