Loosely in order of release date, keeping version variations together for neatness. Click each title for details on the game, links to relevant info, and for downloads! No game roms will be provided for games you can buy on steam, go support the series! This is just so the games not accessible can be saved somewhere for people to play.
Lemme know if there are any issues with any download! I tested to the best of my ability lol.
Guilty Gear (1998)
               
Wikipedia - Fandom Wiki - It's Dustloop page
               
Releases:
               
You can buy this game! It goes for 10 dollars on Steam without sales, so just pick it up officially if you can.
               
Playstation - PS3 - Windows - Switch - PS4
               
 
                  
              
                                    
     
                                               
                                  
                                  
        Guilty Gear X (2000)
    
Wikipedia - Fandom Wiki
    
Releases:
    
Dreamcast - PS2 - Windows
    
    Guilty Gear X Plus (2001)
        
Fandom Wiki
        
        
The passwords from Petit 2 are; 
        
MJNKPNPN - Unlock all Colors
        
3GOU1SAD - Unlock a new Gallery Mode Challenge
        
KYUSBNBN - Unlock Dizzy and Testament as well as GG Mode
        
Releases:
        
PS2
        
    Guilty Gear X Advance Edition (2002)
        
Fandom Wiki - Cutting Room Floor
        
Releases:
        
Gameboy Advance - This site has a built in emulator LOL
                
    Guilty Gear X ver 1.5 (2003)
        
Fandom Wiki - Mibeador's "Guilty Gear X Version 1.5: The Forgotten Gear"
        
Releases:
        
Atomiswave (I for some reason couldnt get MAME to download and its late at night but uhm. this should work ?)
        
 
                         
                              
    Guilty Gear Petit (2001)
      
Wikipedia - Fandom Wiki
      
Releases:
      
WonderSwan
    
 Guilty Gear Petit 2 (2001)
      
        
This game also has passwords; 
        
BLACKMAS - Unlock all Colors and adds a Tension option to the Game Options
        
ADROPOUT - Unlocks Gallery
        
KDOKBNZY - Unlocks GGMillia, GGMay, GGSol, and GGKy
      
Wikipedia - Fandom Wiki
      
Releases:
      
WonderSwan
    
 
                         
                               
                                    
                                
                                    
                                       
        Guilty Gear XX (2002)
    
Wikipedia - Fandom Wiki
    
Releases:
    
PS2
    
    Guilty Gear XX ♯Reload (2003)
    
Wikipedia - Fandom Wiki
    
Releases:
    
You can get the Windows release on Steam! It goes on sale for basically nothing all the time, grab it and the soundtrack!
    
PS2 - Windows - Xbox360 - PSP
    
    Guilty Gear XX Slash (2005)
            
Wikipedia - Fandom Wiki
    
Releases:
    
PS2
    
    Guilty Gear XX Λ Core (2006)
        
Wikipedia - Fandom Wiki
    
Releases:
    
PS2 - Wii
    
    Guilty Gear XX Λ Core Plus (2008)
        
Wikipedia - Fandom Wiki
    
Releases:
    
PS2 - PS3 - PSP - Wii - Xbox360
    
    Guilty Gear XX Λ Core Plus R (2012)
        
Wikipedia - Fandom Wiki - Dustloop
    
Releases:
    
You can buy this game! It has a pretty sizable community around it, so while its complex and difficult, picking it up to mess with really isnt!
    
PS3 - PSV - Xbox360 - Windows - Switch
    
 
                             
                                      
                                      
                                      
                                      
                                      
        Guilty Gear Isuka (2004)
          
Wikipedia - Fandom Wiki
    
Releases:
    
You can buy this game on Steam!
    
PS2 - Xbox360 - Windows
    
 Guilty Gear Club/Mobile (2006)
        
Fandom Wiki
    
Releases:
    
i-mode
    
 Guilty Gear Dust Strikers (2006)
        
Wikipedia - Fandom Wiki
    
Releases:
    
DS
    
 Guilty Gear RoA (2006)
       
Fandom Wiki - The archived website
    
Releases:
    
i-mode
    
 Guilty Gear Judgment (2006)
        
Wikipedia - Fandom Wiki
    
Releases:
    
PSP
    
 Guilty Gear 2 -Overture- (2007)
        
Wikipedia - Fandom Wiki
    
Releases:
    
You can buy this on Steam!
    
Xbox360 - Windows
    
 Guilty Gear Vastedge XT (2013)
        
        My history with Vastedge can not be summarized here, it'll get its own page soon. Mostly as a cry for help! For now, heres my tumblr post with what we have so far.
        Guilty Gear Xrd -Sign- (2014)
        These next three are pretty self explanitory at this point, so I'll keep it short. 
        
Guilty Gear Xrd[a][b] is a fighting video game sub-series by Arc System Works and part of the Guilty Gear series. Guilty Gear Xrd was developed using Unreal Engine 3, with cel-shaded graphics in place of the series traditional hand drawn sprites. Following the storyline of the last game in the series, Guilty Gear 2: Overture, it introduced seven new characters.
The first Xrd game, Guilty Gear Xrd Sign, was released in arcades on February 20, 2014, as the 5th main installment, and for the PlayStation 3 and PlayStation 4 in Japan and North America in December of the same year. A digital-only release happened in Europe in June 2015, and it was brought to Microsoft Windows via Steam on December 9, 2015. The game has been praised for its cel-shaded graphics and approachable gameplay, but criticized for its non-interactive story mode and smaller roster of characters.
A sequel follow-up,[c] titled Guilty Gear Xrd Revelator, was released on consoles in May 2016 in Japan and June 2016 elsewhere as the 6th main installment. An update title to Revelator titled Guilty Gear Xrd Rev 2 was announced at Arc System Works Fighting Game Award 2016 on January 14, 2017, and released for Arcades in March 2017, while PS3, PS4 and PC versions were released worldwide at the end of May 2017. The Rev 2 update patch for those who bought Revelator on PlayStation Store or Steam was released as a paid DLC. The PS4 also received an exclusive physical disc version.[9] 
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        Guilty Gear Xrd -Revelator- (2015)
        The game uses a six-button layout: five of which are responsible for the attacks—punch, kick, slash, heavy slash and dust—, and the other one for taunting or respecting the other player. There are several other techniques which are triggered when two or three buttons are pressed simultaneously.[10] A burst gauge is filled as time goes by or when the player receives damage; once the gauge is filled, the player can perform a Psych Burst to move away from the opponent. It unleashes a blast of energy that, if it successfully hits the adversary, completely charges another gauge, the tension gauge. The tension gauge allows the player to perform certain other special attacks.[11]
The game features four main modes: Network Mode, Practice Mode, Battle Mode and Story Mode. The first allows online matches through the PlayStation Network (PSN), which may be ranked in world rankings. The Practice Mode features a regular training mode, a tutorial mode that teaches the basic controls, a mission mode that simulates battle situations, and a challenge mode that is focused on performing combos.[12]
The Battle Mode comprises the arcade mode, which unveils part of the game's story after the player defeats eight opponents; a versus mode, in which the player can have offline battles with a second player or against a CPU; and a special "M.O.M" mode.[12] The M.O.M. Mode, which is an acronym for "Medal of Millionaires", is a variation of the regular survival mode in which the player earns medals based on performance and improves through a progression system.[13]
The last mode of Guilty Gear Xrd is the Story Mode, which is new in the current installment. This mode presents the full game story as a film-like animation divided into several chapters, for uninterrupted viewing. The viewer can pause the movie at any time to investigate a glossary of game terms and plot devices, which are described in the library mode. 
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           Guilty Gear Xrd Rev 2 (2017)
        The game is set in 2187, one year after its predecessor, Guilty Gear 2: Overture.[14]
Starting in Sign's storyline, the first part is set in arcade mode through each characters' own storyline, and focuses on Ramlethal Valentine's arc, while the second part of the storyline is set after arcade mode's storyline on the console version, focusing on after the capture of Ramlethal in Conclave and Justice's arc, and also serves as the beginning of Elphelt Valentine's arc in the final chapter.
Later in Revelator/Rev 2, the storyline now focuses on Elphelt Valentine and Jack-O's arc since the final chapter of Sign's story mode on console version.
Additional storyline of Rev 2 follows the concluded epilogue of Revelator's story.
See also: List of Guilty Gear characters and Guilty Gear § Playable characters
The arcade version of the game initially featured thirteen playable characters. Sol Badguy, Ky Kiske, Millia Rage, May, Chipp Zanuff, Potemkin, Venom, Axl Low, I-No, Faust, Slayer, and Zato-1 return from previous installments, while one new character, Bedman, has been added.[15][16] The game also features a new boss character known as Ramlethal Valentine, who was added to the playable roster in arcades via an update.[17] Additionally, the console versions add Sin Kiske from Overture, and new characters Elphelt Valentine and Leo Whitefang, as playable DLC characters,[18] bringing the total roster count to 17.[19] The console exclusive characters Sin, Elphelt, and Leo were added to the arcade version along with balance changes on March 19, 2015.[20]
The sequel, Revelator, made balance changes[21] and added Johnny, who was non-playable in -SIGN-'s story mode, and a new female character named Jack-O' Valentine.[4][6] Along with returning Jam Kuradoberi as a playable character,[22] Revelator also gives Sign's newcomer Elphelt a darker look for story purposes.[23] Another returning character, Dizzy, was also added to the playable roster as the result of a fan vote conducted by Arc System Works, defeating Bridget and Baiken in a close race, with a total of 32,990 votes.[24] The new character introduced in Revelator, Kum Haehyun, who is non-playable in the arcade version, was announced as a DLC character for the console version.[25] Raven from Guilty Gear 2: Overture is the last of the six new additions to the Revelator sequel.[26]
Baiken, on the other hand, returned as playable in an updated version of Revelator, titled Rev 2, followed by a new character who is a chief officer of Chipp Zanuff, Answer. 
Buy it
        Guilty Gear -Strive- (2021)
        Just go play Strive.