Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Mantis Bug Tracker - Mantis Bug Tracker is a free and open source, web-based bug tracking system.
Cvent - Cvent's event management software provides event planners with a complete solution to increase event attendance and decrease event costs.
Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.
EventMobi - EventMobi is an interactive mobile event app, audience response and engagement platform for conferences and trade shows.
Redmine - Flexible project management web application