| ID | Name | Type |
|---|---|---|
| #10079 | Muszaki Konyvkiado | ? |
| #16481 | My Cat Software | Z |
| #10080 | MyKAT | ? |
| #10081 | MyKat | ? |
| #18188 | Myke Pickstock | + |
| #19784 | MykeP | - |
| #10082 | Myrmidon Software | P |
| #10083 | Myrna Silver | ? |
| #10084 | Mystery Software | Z |
| #10085 | Mystic Software | Z |
| #10086 | Mythos | ? |
| #10087 | Mythos Games Ltd | Z |
| #10088 | Mythsoft | Z |
| #8934 | MájaSoft | Z |
| #21867 | Márcio José de Carvalho | + |
| #20292 | Mária Koscelníkova | + |
| #22790 | Mário Armão Ferreira | + |
| #21359 | Mário Cabral | + |
| #23007 | Mário Sequeuira | + |
| #19728 | Mário Viegas | + |