Indeed, it is even community developed now, ports and bugfixes: http://arx-libertatis.org/
The Arx Libertatis project reached recently 1.1.2.

You are welcome. :)
Feel free to vote for the community wish "GOG should care for source code!"

Liberatedgames is nice, but lacks links to many mods and compiling instructions. Time to (try to) compile some things around christmas if they don't come to GOG.

happened already some time ago, still: http://conquestfrontierwars.weebly.com/1/post/2014/01/conquest-frontier-wars-source-code-out.html

Source code of "Conquest: Frontier Wars" is now part of the gog extras. :)

(and work is to do in fact, for compatibility but compiling seems to be a challenge but recently some progress it looks like)

Whenever I see a necro, I half-expect to see you without the blue status. :P

Tyrian is kind of open source. The original code was never released, but the developers of OpenTyrian were given it and used it as their basis for OpenTyrian.
http://en.wikipedia.org/wiki/Tyrian_(video_game)#OpenTyrian
https://code.google.com/p/opentyrian/

Meh, forget it.

thnaks!

another one, dark reign 2 (but looks like no one made use of the available source code, up to now)
http://www.gog.com/forum/dark_reign_series/dark_reign_2_open_source_now

PS: and hopefully in the near future, Divine Divinity
Divine Divinity: Larian and gog, please allow the community to help you! :) (Source code)

I kinda want Square-Enix to release classic Tomb Raider source code for the public, and i want to see similar project like this ´http://www.tomb-raider.wikia.com/wiki/OpenTomb

The source code became available to some community members who work now on patches. (OldUnreal)

Good idea too... a important classic game and should be therefore also preserved code wise.

Another game here an gog with source code available Warlords-Battlecry-3 (and some resulting patch efforts)

That's still not open-source though. Only the people who received explicit permission may use the code and only under certain conditions. It's as if Epic hired a freelance programmer to write patch, except these guys didn't get payed for the work.

Open source enough for my taste, as fixes, adaptions, mods are possible. Even if the FSF disagrees, I think it is value in giving orphaned works to the caring communities, also under clauses.

Oh sure, it is much better than letting the code rot on some discs in in the basement, but it could go one step further. Just look at what people have been able to do with the source for games like Descent, it runs on modern systems, has support for modern input devices, modern resolutions, smoother gameplay, updated graphics, updated multiplayer, updated everything. Plus it run on operating systems that didn't even exist at the time.
http://www.dxx-rebirth.com

Yes, I completely agree, free licensed is better... but my main concern is the conservation of the source code overall. Better a developer gives the source for closed preservation to e.g. the Library of Congress (Duke Nukem PSP) or under a somewhat restrictive license to the community, e.g. non-commercial clause Descent, than preventing the preservation of source code overall by demanding public domain/GPL/creative-commons licenses ONLY. Better some restrictive construct, the developer feels comfortable with, than no source code at all.

Infact, many companies decided for own licenses (instead of standard one like GPL) when they decided for giving the source code out in some form, see a good overview of cases here: List of commercial video games with available source code

What do you think about Original War then? Stucuk has been given the code from Bohemia Interactive, but he is under NDA so he can't distribute it. He is the one currently supporting the game though.