Is anyone here familiar with anime remixes or anime doujin albums? I'm sure there are a lot of them around, but I'm not familiar with them much at all so I have no idea where to start.

I know of Exit Trance albums, which feature anime opening and ending songs in trance style, but that's about it. So any recommendations on albums or sites where to find info would be much appreciated.

(I tried searching the forums, but I couldn't find anything related.)

There might be some good tips on the DoujinStyle forums.
If all else fails, just start wading through VGMdb
The advanced search is really good, I often forget to use it.

Are you looking for only electronic genre albums? There aren't a whole lot of doujin circles who cover anime, it seems to get smaller every years just like game covers, and they tend to not do much electronica that I have found. Example: GlariZ is a Doom/Drone metal band covering Madoka Magica.

In the early 2000's you had the Ultra Anime Eurobeat Parapara series of albums

Well, albums in electronic genre would be best, but I was kind of also trying to ask if there exists something like OCRemix for anime. I have some anime doujins, which are not electronic music, but I thought there must be heaps more (but maybe not?). Thanks for the tips everyone, I need to check out that DoujinStyle.