What are 'replicant' and /e/?

[saba]

I think Replicant is android without the non-free blobs and it only works on a few phones, mostly older hardware like some of the early Galaxy phones. And I think /e/ is a custom android rom where they try to replace gmail and some other google services with their own.

edit: Android is open source(the base android system/AOSP), but the google apps and services are not.