The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- "Explorer" Scout Ships (3 members)
- 'Geneering Products products (3 members)
- 121-B (2 members)
- 1550-LEX space yachts (4 members)
- 1970s computer and video games (2 members)
- 1976 releases (1 member)
- 1977 comic book issues (11 members)
- 1977 magazine issues (8 members)
- 1977 releases (30 members)
- 1978 comic book issues (62 members)
- 1978 magazine issues (28 members)
- 1978 releases (30 members)
- 1979 comic book issues (64 members)
- 1979 magazine issues (6 members)
- 1979 releases (29 members)
- 1980 comic book issues (60 members)
- 1980 magazine issues (10 members)
- 1980 releases (56 members)
- 1980s computer and video games (9 members)
- 1981 comic book issues (25 members)
- 1981 magazine issues (5 members)
- 1981 releases (27 members)
- 1982 comic book issues (27 members)
- 1982 magazine issues (6 members)
- 1982 releases (27 members)
- 1983 comic book issues (56 members)
- 1983 magazine issues (12 members)
- 1983 releases (80 members)
- 1984 comic book issues (68 members)
- 1984 magazine issues (5 members)
- 1984 releases (35 members)
- 1985 comic book issues (70 members)
- 1985 magazine issues (5 members)
- 1985 releases (44 members)
- 1986 comic book issues (55 members)
- 1986 magazine issues (5 members)
- 1986 releases (50 members)
- 1987 comic book issues (7 members)
- 1987 magazine issues (2 members)
- 1987 releases (60 members)
- 1988 comic book issues (5 members)
- 1988 magazine issues (7 members)
- 1988 releases (34 members)
- 1989 comic book issues (1 member)
- 1989 magazine issues (13 members)
- 1989 releases (60 members)
- 1990 magazine issues (15 members)
- 1990 releases (38 members)
- 1991 comic book issues (1 member)
- 1991 computer and video games (3 members)