This site lists the communities on -shall not be named- that have either migrated or are also located on different sites. It also lists whether it is the official community or a spin off. A very helpful tool for those who have rid of -shall not be named- and have forgotten communities they once followed.
I never knew about this, thanks for the YSK!
Lost track of a lot of subs in the process of jumping over here. This helps out a ton is finding those niche subreddits.
subreddit?