Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Unity - The multiplatform game creation tools for everyone.
Eventzilla - Eventzilla lets you sell tickets online and manage attendees from one integrated application.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Splash - Anyone can create a Splash event, whether you're a company hosting a single event or an individual hosting a personal event like a birthday or wedding. Get Started for Free. Text goes here. X. Full Event Program.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.