You won't get an answer here.
You really should just Google it.
There is no list. There is no one collection of these MODS.
I don't know if you are referring to MODS, as those coders/hackers that MODify Android, or if you are looking for MODifications to android.
Either way, you are asking for one helluva long ass list if you think one exists.
There are literally thousands of MODifications you can do to an android device.
There literally hundreds of android MODifiers/coders/hackers/developers, etc.