The "open" variants of those you list can be compiled, installed and used practically without significant compromise - they are genuinely useful. The exception

The "open" variants of those you list can be compiled, installed and used practically without significant compromise - they are genuinely useful. The exception is AOSP. There are very few devices where you can compile and install AOSP and have a genuinely useful result. Compiling alone is fairly useless if the binaries you generate can't be used for any purpose. You may recall the maintainer recently quit because it became an untenable position: https://plus.google.com/112218872649456413744/posts/9HHRURorE7g https://plus.google.com/112218872649456413744/posts/9HHRURor...