Free for Reactants:

Part of The Reactor:
Also on Clickstore:

The Reactor provides you a whole new open sourced example with the "Coolest Level Editor". Learn how to build level editors and loaders for your project quickly and easily with this intuitive method. Comes complete with save and load routines and is easy expandable. This example also includes....

-Data storage via the list object
-String parser 2 object use for level data encoding
-Easy to understand singe or drag & drop tile placement
-Parallax level building
-Multiple external dialog object use
-Configurable snap to grid tile and cursor control
-Easily add new tile types to the example
-And much more!