Looks quite nice. For the lazy it is currently IntelliJ, Textmate, Atom, Emacs and Vim. I'm going to guess that adding a new IDE is relatively straightforward depending on how that IDE stores its themes.<p>I suppose it's a question of how many people switch IDEs etc. If you only use one, then you may as well use the theme-editor that comes with that, even if that is just editing the preferences and then checking. But if you switch IDEs a lot then I guess configuring/storing a theme once is quite useful.<p>Personally I don't switch much and when I do I'm happy to use different themes for different IDEs. But I'm sure there are others who would appreciate this.