Anxietycoach.com has been very helpful for me--just adding to the chorus since some time has passed since it was originally shared here.

There's a zine too from Dr. Faith Harper I really like, it's available on the Microcosm Publishing site (I'm too new to be able to add the link here but you can find it easily), called "This is Your Brain on Anxiety: What Happens and What Helps." It's really short and straightforward, good for quick consultation in the moment.