Minetest - Minetest is a near-infinite-world block sandbox game and a game engine, inspired by InfiniMiner...
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Minecraft - A block-building game that allows you to create and explore entire worlds from scratch.
Cvent - Cvent's event management software provides event planners with a complete solution to increase event attendance and decrease event costs.
Terasology - Terasology (started under the name Blockmania) is an open source project started by Benjamin...
Ticket Tailor - Ticket Tailor is an easy-to-use event ticketing platform that allows event organizers of all shapes and sizes to sell tickets online.