Realtime CSG is a level design tool for Unity that allows you to design levels in Unity using boolean operations / CSG; It uses an unique algorithm that makes it possible to perform these boolean operations in real-time! Even while having thousands of brushes in the scene. If you'd like to know more, just visit the Real-time CSG site here! Some key features: You can create your own prefabs that you can then drag & drop in the scene. While dragging your prefabs the scene will update in real-time and your prefabs will align to the surface beneath your mouse. All while aligning to the grid of course! You can create your brushes, the building blocks with which you build your level, by just drawing and extrude the shape you just drew! You can do this on any surface, not just the grid plane Curved edges can be used to created curved surfaces You can also quickly create standard shapes such as cubes, cylinders and stairs Brushes can also be edited by moving vertices, edges or rotating and scaling polygons. It's also possible to chamfer vertices or edges As for texture tools, there are plenty of things to help you there. For example, you can easily drag your mouse over multiple surfaces and the material will follow your mouse over all these surfaces . Keep in mind the project is still quite young, so more and more will be added over time! This is just the beginning. If you have a need for certain features, let me know!