For D&D4: The Witch Player Class
A decent witch class for D&D4. Predates the witch that appears in Heroes of the Feywild by a few years, but is roughly compatible.
For Witch Girls Adventures: Original Witch Girls (OWG)
The comic that came before the RPG. The first 200 or so pages are comic content of various artists, but all in the WitchGirls School and world. The next dozen or so pages is the Coventry School written up for the Witch Girls RPG. And we end with WGA write-ups for all the characters that appeared in the comics.
One of the great things about the Witch Girls game are the characters. So this is a nice treat really.
If you are a fan of the game and want some more NPCs for your own school or need some ideas on adventure then this is a great book to have.
For Colonial Gothic: Witchcraft
I enjoy the Colonial Gothic game quite a bit. I love how it weaves the earliest American history with horror and monsters.
I was set to like this book quite a bit and I do, don't get me wrong, but it wasn't quite what I was expecting given how much I enjoyed all the other CG books.
This book gives us Witchcraft for the CG world and it does a great job of researching, but it only gives us the "evil" sort of witchcraft associated with summoning demons. Granted, that is perfectly fine for this game. I think I wanted to see a little more.
The first half deals with Witchcraft in the CG world and is great. The second half is from the writings of King James and frankly he was more than just little bit paranoid.
In the end it is still a good book for the game and something to grab if you are interested in thoughts a views on witches of the time.
Of course for my own take, if you are going to assume that King Jame's witches are real then why not Margaret Murray's witches too? I guess I just like having the option of playing a witch in my games.
For Mage: The Sorcerer's Crusade: Witches and Pagans
A great resource for the Renascence era Mage: The Sorcerer's Crusade.
For Mage: The Ascension: Tradition Book: Verbena (1st) (Revised)
More Verbena goodness and more rotes based on the Verbena's sphere of Life.
Both are full of great background information on "witches" in the Mage game and are full of wonderful ideas and great art. This is WW at their peak and there is so much care and detail here that I couldn't not get these books.
For Basic Role-Playing (Call of Cthulhu...): BRP Witchcraft
I reviewed this one in detail here: http://timbrannan.blogspot.com/2010/07/brp-witchcraft.html
Witch Hunter: the Invisible World
I reviewed this one in detail here: http://timbrannan.blogspot.com/2011/03/review-witch-hunter-invisible-world.html
Quest of the Ancients
I have talked about this one before too: http://timbrannan.blogspot.com/2011/04/q-is-for-quest-of-ancients.html
The witch in this book is roughly compatible with AD&D1. Lots of new and fairly cool spells.