The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- piektraining.com (1 member)
- pollackassociates.com (1 member)
- quizlet.com (1 member)
- railAlert (2 members)
- ttmem.com (3 members)
- vena.be (1 member)
- warpedforgood.com (1 member)
- woordjesleren.nl (1 member)