The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 49Games (Developer) (5 members)
- 4A Games (Developer) (1 member)
- 4J Studios (Developer) (2 members)
- 4hit (Publisher) (2 members)
- 4mm Games (Developer) (1 member)
- 505 Games (Publisher) (23 members)
- 5pb. (Developer) (22 members)
- 5pb. (Publisher) (32 members)
- 5pb. Games (Publisher) (1 member)
- 8bit Games (Developer) (1 member)
- 8floor (Publisher) (3 members)
- A.C.R.O.N.Y.M. Games & Eyerisk Studios (Developer) (1 member)
- A.C.R.O.N.Y.M. Games (Developer) (1 member)
- ACE Team (Developer) (3 members)
- AFL Live (Series) (2 members)
- Aabs (Developer) (1 member)
- Aabs (Publisher) (1 member)
- Abstraction Games (Developer) (3 members)
- Accel World (Series) (2 members)
- Access Games (Developer) (2 members)