PhysicsEditor is a powerful tool designed for game developers, particularly those working with 2D games, to create and manage physics bodies and shapes with ease, developed by CodeAndWeb from Germany. It enables users to visually edit the physics properties of objects, such as collisions, densities, and friction, without the need for extensive coding.

Making multiple small images spliced into a large one (sprites sheet), for game development, this can save the storage space and loaded memory that texture images require in game; for web design, this (CSS sprites) can greatly reduce the images loading frequency and time, so as to make web pages load faster. If you want to use Photoshop to do this, that's too stupid and inefficient. Or if you gave Zwoptex up, then it's time to turn to this TexturePacker from Germany.