Libra, the Cancer, and Edanith work with magic a ton! And TRIM/Thanatos Inc. xD Though it's unpleasant on TRIM.
For Libra and the Cancer, you really have free reign with magic! It's a total free-for-all! 8D (We're updating the info to make that more clear! <3)
In Aedolis, mages are less populous, but are allowed--it's just that any that showed magic that could be used as a weapon would be drafted.
On Edanith, mages are VERY important to the nation--but they are essentially enslaved.