There's a wiki page, but it's rarely updated, also not sure if people will guess to look in there first:
http://www.adventuregamestudio.co.uk/wiki/Open_Source_Games
IMPORTANT: Many of these games use older versions of AGS. The latest AGS v3.* versions have full backwards compatibility support, can import and compile older projects, but this often it requires changing "compatibility" options in General Settings. These are described in this section of the manual:
https://adventuregamestudio.github.io/ags-manual/GeneralSettings.html#backwards-compatibility
In addition, there's a serie of articles addressing an upgrade of an older game to a newer version of AGS:
https://adventuregamestudio.github.io/ags-manual/UpgradingFromPreviousVersion.html
If you know which version the game was made in, you may try to sequentially upgrade it (although that might take much more effort than switching a compatibility option).
IMPORTANT: Remember to do "Build" -> "Rebuild all files" after the opening a project: that will recompile and resave all the rooms in the new format.
(Of course you also might have to fix scripts in rooms during this)
LIST UPDATED 30 June 2023:* "A Suspicious Date": https://github.com/alkhimey/MAGS-May-19
* "AGS Awards client" (networking code!): https://bitbucket.org/agsa/ags-awards-source/src/master/
* "Aeronuts" (adventure + top-down fighter mini-game): http://shatten.sonores.de/wp-content/uploads/2014/09/AeroNuts_OSS.7z
* "Art of Dying", arcade, distributed with the source: http://www.adventuregamestudio.co.uk/forums/index.php?topic=49687.0
(Source code is available here: http://gamejolt.com/games/the-art-of-dying/21047)
* "Byte of the Draculator II": http://www.vanwijst.com/games/swarm/draculator_source.zip
* "Black Cauldron Remake" distributed with the source (last time I checked): http://www.classic-retro-games.com/Black-Cauldron_118.html
* "Cargo": https://github.com/SpookyFM/Cargo
* "Cart Life", a sim / management game: https://github.com/gondur/cartlife_src
* "Cameras Tech Demo" (technical demo): https://github.com/ivan-mogilko/ags-camdemo
* "Cat Ventures" (uses python scripts for generating Rooms): https://github.com/juanmcasillas/CatVentures
* "Demo Quest", an ancient demo game, uses deprecated script: https://github.com/adventuregamestudio/ags-demo-quest
* "Dungeon Hands" (card game): https://github.com/ericoporto/DungeonHands
* "Eternally Us" distributed with the source: http://www.adventuregamestudio.co.uk/site/games/game/1303/
* "Hell Puppy" (arcade): https://github.com/VacaRoxa/dogfromhell
* "ICBM", a sim-game, distributed with the source: https://gamejolt.com/games/icbm/57197
* "Last & Furious" (top-down racing): https://github.com/ivan-mogilko/ags-lastfurious
* "Oceanspirit Dennis", a big collection of joke games by various authors: https://www.adventuregamestudio.co.uk/forums/adventure-related-talk-chat/the-oceanspirit-omnibus/
* "Open Quest" (a simple demo game made in 2007): https://www.dropbox.com/s/3g01fjudw71xuld/OpenQuest_AGS.zip?dl=0
* "Read A Book": https://github.com/karjonas/Read-A-Book
* "Rescue Mission": https://github.com/ConeRX/RescueMission
* "Space Pool Alpha": http://www.kweepa.org/step/ags/games/SpacePool.zip
* "The 4th Wall": https://github.com/hewills/the4thwall
* "Three Little Pigs Remediation": https://github.com/KostisMon/Three-Little-Pigies--Remediation
* "Wilfred 2088": https://github.com/hewills/Wilfred-2088
* "WOO" (a base building sim purely run by AI), made in v2.72: https://www.mediafire.com/file/juwgcjolmdd/Woo_project_1_2_4_272.zip/file
Also for the record:
Spoiler
Here are some previous threads on this topic where people were trying to get a list of open sourced games:
http://www.adventuregamestudio.co.uk/forums/index.php?topic=26688
http://www.adventuregamestudio.co.uk/forums/index.php?topic=32424
http://www.adventuregamestudio.co.uk/forums/index.php?topic=39795
Nice. I notice Space Pool Alpha is missing from that list.
That's my contribution :P And no reason there shouldn't be one.
Oddly not mentioned in any of those threads, pretty much all the Oceanspirit Dennis games are open source.
Edit: Here, have a link! http://www.adventuregamestudio.co.uk/forums/index.php?topic=43979.0
Great idea !
I just added my game on the wiki. Maybe we should also keep it updated?
Somebody could do a section of up-to-date and well coded open-source projects, to avoid having only a unsupervised list of hundreds of open source games.
All the existing links are broken BTW, refering to adventuregamestudio.co.uk
Here's another entry for the OSS list:
http://www.adventuregamestudio.co.uk/forums/index.php?topic=39407.msg636496285#msg636496285
The Swarm Project's Byte of the Draculator was also opened sourced: the link is in this post (http://www.adventuregamestudio.co.uk/forums/index.php?topic=44774.msg599213#msg599213).
The (in)famous Eternally Us (http://www.adventuregamestudio.co.uk/site/games/game/1303/) is open source.
The Art of Dying (http://www.adventuregamestudio.co.uk/forums/index.php?topic=49687.0) platformer game by dkh (scroll down for source link).
AGS IRC Ceremony (http://www.adventuregamestudio.co.uk/forums/index.php?topic=50165.0) (with network support)
Sorry for bumping, but someone asked about this on Discord lately, and I decided to post little more.
"AGS Awards" repository: https://bitbucket.org/agsa/ags-awards-source/src/master/
My two games, but have to warn that they are not "conventional".
"Last & Furious" (topdown racing): https://github.com/ivan-mogilko/ags-lastfurious
"Cameras Tech Demo" (technical demo, work in progress): https://github.com/ivan-mogilko/ags-camdemo
Games by eri0o I remember about:
"Dungeon Hands" (card game): https://github.com/ericoporto/DungeonHands
"Hell Puppy" (arcade): https://github.com/VacaRoxa/dogfromhell
Byte of the Draculator II
http://www.vanwijst.com/games/swarm/draculator_source.zip
(if clicking on the link does not work, do right-click and save as)
Ancient demo game which was distributed with AGS in the past:
https://github.com/adventuregamestudio/ags-demo-quest
(not a very suitable game in my opinion)
I have some I keep collecting in a list, but I am not aware the forum name of all authors:
Cart Life, by Richard Hofmeier (AGS 3.4 fork)
https://github.com/gondur/cartlife_src
Cargo (2014)
https://github.com/SpookyFM/Cargo
Rescue Mission (AGS 3.3)
https://github.com/ConeRX/RescueMission
Cat Ventures (uses python for Rooms)
https://github.com/juanmcasillas/CatVentures
The 4th Wall (AGS 3.3, MIT) by Hana Indiana
https://github.com/hewills/the4thwall
The Mind (2020), by Hana Indiana
https://github.com/hewills/The-Mind
Read A Book
https://github.com/karjonas/Read-A-Book
A Suspicious Date
https://github.com/alkhimey/MAGS-May-19
Three Little Pigs Remediation
https://github.com/KostisMon/Three-Little-Pigies--Remediation
Wilfred 2088 by Hana Indiana
https://github.com/hewills/Wilfred-2088
Space Pool Alpha
http://www.kweepa.org/step/ags/games/SpacePool.zip
"ICBM" by Michael Davis / REPVBLIC, has project source available on gamejolt:
https://gamejolt.com/games/icbm/57197
with original art and soundtrack too.
I bump this again with a suggestion to make this topic sticky, or create another sticky topic with an updated list of open source games (not certain about the appropriate forum section for this).
EDIT: updated a game list in the first post.
This topic now lives in the Advanced Tech forum and is stickied. :)