Wintermute is kind of like 3DGS of the 2D and 2.5D world. It has templates, a decent but less active forum, it comes with it's own editors(which are going to be overhauled and improved), and is powerful. It has a full scripting language so you can add what you want...it's kind of similar to c-script but it has a few little quirks that set it apart. The developer listens to the users and updates are fairly frequent. And, finally with this new update a full plugin component is in place, so that makes it even more flexible for more advanced users.