Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.

Tix - Tix is a state-of-the-art, cloud-based ticketing system that features fully integrated access controls, event management controls, multi-channel distribution capabilities, and a robust reporting suite.

Galette - Galette is a membership management web application towards non profit organizations.

Prekindle - Prekindle is a simple yet powerful event management, ticketing, and marketing platform that helps businesses to sell tickets to the event online and spread the word.

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

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