| 11 Bit Studios | October 7, 2010 | 4 | 6 |
| 3R Games | 2010 | 1 | — |
| 7A Games | January 23, 2017 | 1 | — |
| Acram Digital | 2014 | 3 | 3 |
| Adria Games | — | 1 | — |
| AFTERBURN | November 20, 2016 | 1 | 1 |
| Aidem Media | September 10, 1997 | 4 | 4 |
| All in! Games | 2018 | 2 | 9 |
| Ancient Forge | — | 1 | — |
| Anshar Studios | 2012 | 3 | 2 |
| Art Games Studio | — | 5 | 10 |
| Artifex Mundi | 2006 | 14 | 70 |
| Awaken Realms | — | 1 | 3 |
| Awesome Games Studio | — | 1 | 1 |
| Baltoro Games | — | 4 | 4 |
| Bit Golem | 2015 | 1 | — |
| Bloober Team | 2008 | 5 | 1 |
| Blue Sunset Games | 2016 | 2 | — |
| Brave Lamb Studio | — | 1 | — |
| Byterunners | — | 1 | — |
| CD Projekt | May 1994 | 1 | 5 |
| CD Projekt RED | February 2002 | 14 | 6 |
| Cdp.pl | 2012 | — | 4 |
| Cenega | — | — | 2 |
| Chaos Group Games | 2016 | 1 | 1 |
| CI Games S.A. | 2002 | 10 | 15 |
| Cleversan Games | — | 3 | — |
| COMADSOFT | February 10, 2014 | 1 | 1 |
| Covenant.dev | 2020 | 1 | 1 |
| CreativeForge Games | 2011 | 3 | 5 |
| Crunching Koalas | 2012 | — | 2 |
| Destructive Creations | 2014 | 2 | 2 |
| Dev4Play | — | — | 1 |
| Drageus Games | — | 3 | 7 |
| Drago Entertainment | 1998 | 3 | — |
| DreamStorm Studios | — | 1 | — |
| Duality Games | — | 3 | 2 |
| Eremite Games | — | 1 | — |
| Feardemic | — | — | 3 |
| Fireline Games | — | 2 | 2 |
| FluckyMachine | — | 1 | — |
| Flying Wild Hog | 2009 | 6 | 1 |
| Forever Entertainment | 2010 | 5 | 21 |
| FreeMind | — | 1 | — |
| Fulqrum Publishing | — | — | 4 |
| Hamster On Coke Games | April 2012 | 1 | 1 |
| Hydra Games | — | 1 | 1 |
| Hyperstrange | 2015 | 3 | 5 |
| IMGN.PRO | — | — | 3 |
| Infinite Dreams | 2006 | 8 | 4 |
| Institute of National Remembrance | 1998 | — | 1 |
| Juggler Games | 2015 | 2 | — |
| Jutsu Games | — | 3 | — |
| Klabater | 2016 | 4 | 19 |
| LK Avalon | 1989 | 1 | 2 |
| L’Art | 1996 | 3 | — |
| MD Games | — | — | 2 |
| Metropolis Software | 1992 | 3 | 1 |
| Mirage Media S.C. | — | 2 | — |
| Movie Games | — | — | 1 |
| Naptime.games | — | 1 | 1 |
| No Gravity Games | 2016 | — | 24 |
| Noobz from Poland | — | 1 | — |
| One More Level | 2014 | 3 | 1 |
| Orbital Knight | 2012 | 2 | — |
| Paranoid Interactive | — | 1 | — |
| People Can Fly | 2002 | 1 | — |
| Pixelated Milk | — | 2 | 1 |
| Play-It | 1999 | — | 1 |
| PlayWay | 2011 | 1 | 28 |
| Polyslash | 2015 | 2 | 1 |
| Prime Bit Games | 2017 | 3 | 3 |
| Prison Games | — | — | 2 |
| QLOC | 2009 | 6 | — |
| QubicGames | 2004 | — | 4 |
| Reality Pump Studios | 2003 | 4 | — |
| Recloak | — | 2 | 2 |
| Red Dot Games | — | 4 | — |
| Red Limb Studio | 2016 | 2 | 2 |
| RedDeerGames | — | 1 | 23 |
| Rejected Games | 2012 | 1 | — |
| Render Cube | — | 1 | — |
| Revulo Games | — | 3 | 3 |
| Ringier Axel Springer Polska | 1994 | — | 2 |
| Scriptwelder Studio | — | 14 | 1 |
| Silesia Games | — | — | 6 |
| Simrail S.A. | — | 1 | — |
| Simteract | — | 1 | — |
| Sonka | — | 1 | — |
| Spokko | — | 1 | — |
| Star Drifters | — | 2 | 2 |
| Starward Industries | 2018 | 1 | — |
| T-Bull | 2010 | 1 | 1 |
| Tate Multimedia | 2000 | 5 | 2 |
| Tequila Mobile | December 27, 2007 | 1 | 1 |
| The Farm 51 | 2005 | 5 | 2 |
| The Knights of Unity | 2015 | 1 | 2 |
| The Parasight | — | 1 | — |
| Transhuman Design | — | 1 | 1 |
| Ultimate Games | — | — | 17 |