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.
Nexus One - retired
Proudly rocking the LG G2X 2011/04/20
LG G2X rooted 2011/04/21
As of Mar. 08, 2012 - G2X is now for sale
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I finally upgraded from CM7 to CM9 on my NookColor 2012/01/19