Zelda Classic / ZQuest Engine
Began as pixel perfect recreation of original Legend of Zelda for DOS. But advanced to cross-platform (DWOL) & for other 2D Zelda-likes or platformers
The first video game about Zelda Classic / ZQuest Engine was released in 1999.
Armageddon Games has published all these games
DOS 1.00, 1.84, 1.90, 2.10
W32 1.00, 1.84, 1.90, 1.92b152, 1.92b163, 1.92b182, 1.92b183, v1.92b184, 2.10, 2.11, 2.50, 2.50.1
Linux 2.10, 2.10.2, 2.10b784, 2.11, 2.10 lost isle, 2.11 lost isle, 2.50, 2.50.1
OSX 2.10, 2.50, 2.50.1
Quests are known for 1.87, 1.88, 1.89, 1.90, 1.92b163, 1.92b182, 1.92b183, 1.92b184, 2.10, 2.10 lost isle build, 2.11, 2.11 lost isle build, 2.50rc4, 2.50
Eventually, the vast majority of quests were updated to, 1.90, 2.10, and 2.50. 1.90 is rare now.
Players for every version are archived on the site for Windows only. Linux, DOS, and Mac uses must find rare players elsewhere.
Additionally, the Zelda Classic game engine, with v2.5, would eventually be used to create games vastly different from the original Zelda game. This includes scrolling shooters and 1st-person 3D games.
There could be a case made that Zelda Classic is an unofficial port. In that much of the graphics are ripped from actual Zelda games. But this is not entirely accurate to say either.
Later, 2012-10-12, it was announced "Zelda Classic is going into wild new territory, Open Source. We are also looking for Web Developers to help get ZeldaClassic.com modernized and revamped. If you would like to help contact a member of staff. See DarkDragon's post here." on the ZC homepage. The announcement was not 100% clear but on 2012-12-21 this was said in the forums along with the final release of v2.5 "As announced earlier this year, the 2.50 source code (minus a few bits related to quest encryption) will be publicly released under the GPL. The timeline for this release has yet to be announced."
So it seems that in the end (at armageddon maybe), ZC/ZQ will be GPL.
Yet, here it is 2015 and no official code releases
2015-04-23 08:57 PM PMT
We're pretty close; the main thing we need to do at this point is get the license written up. That's been true for a while, though...