UECIDE is aiming to be a generic IDE based on the Arduino IDE which can easily support ALL the available boards. It does this by not supporting any boards directly but providing a framework where a board developer or fanatical group can simply drop in the definitions for the boards and the chip on the boards without having to make any modifications to how the IDE works.
Much of the original Arduino IDE code has been ripped out and replaced with custom code that is aimed at being 100% generic. Gone are all the hard-coded executables. Gone is the old single-core structure. Say hello to a nice clean structure which separates the cores from the IDE, and the boards from the core. More Info »
Also the IDE itself has had a bit of a makeover. Re-branding the IDE to match your corporate identity is now nice and simple - just a collection of PNG files (gone are the old ropey GIF files) and a couple of text files to create a completely unique branded IDE with no programming whatsoever.
Another major aim of the project is to make it simple to build the IDE for all major platforms (Windows, Linux, Mac, etc) with just one command on a single machine. No need to switch to another operating system just to create the IDE for that platform.