Your Window to Inspiration: Seamlessly Browse Tumblr!
For all my furry folks out there (and anyone looking to open a forum tbh), the closure of Furaffinity Forum will probably inspire others to make their own replacements. Here is my advice to those people:
Do not pay for forum software
They offer you nothing that you can't recreate using completely free software and some programming knowledge. Subscription services/licensing fees for paid forum software is a gigantic money sink. Put your priorities into a reliable domain and host instead, you'll save yourself down the line.