What organizations or people create ROMs for Android phones?

[AC Question]

I was wondering who creates ROMs for phones. I've seen many people download Android Lollipop ROMs on phones who didn't receive the update. I was wondering who would I contact and request them to make an Android Lollipop or Android Marshmallow ROM? Since I have a phone that never got the Android Lollipop update (it runs 4.4.2 KitKat) and I want to have a Android 5.0 (or 6.0) ROM created for my phone.

 

[srkmagnus]

Welcome to Android Central!

You're best bet is to head over to XDA and find the forum for your phone. XDA is the best place to find developers and other android enthusiast who create ROMs and other modifications/themes for devices.