MrFlibble wrote: ↑August 4th, 2011, 7:18 pm
Not long ago I've become interested in freeware games whose authors seem to consciously imitate well-known classics, or at least closely follow them in design. If a commercial game of this kind could be considered a "clone" (made to repeat the original's success on the market), freeware games usually aim for accurate recreation of the game's atmosphere and mechanics, as people behind them are more often that not dedicated fans of the originals. Many of these are open source games, but not all of them, so there's only a partial overlap with Open Source Game Clones
Update from 2021/07/27:
A complete overhaul of the lists, using new groupings, which are hopefully more informative.
1. Original engine + free/libre game data
These are games based on the original code of their inspirations. Often, a free/libre game data set (levels, graphics, music) is created as a replacement for the original proprietary game data, while the playing mechanics remain the same, but sometimes, other aspects of gameplay undergo considerable alterations, which is reflected by the [mod] suffix in the list below.
In some cases, the source code/engine is still not public, but has been provided by owners to the community so that new free games or mods may be created.
Yet another case when the code is not available are various game construction sets that allow users to freely distribute games created with them. These are marked with the [toolkit] suffix.
The Bard's Tale
Duke Nukem 3D
Quake III Arena
Steel Panthers II: Modern Battles
The Ultimate Doom
2. Engine recreation + free/libre game data
Very similar to the above, but the original game source is not available in any form, so an attempt is made to recreate it from scratch and/or by means of reverse engineering. Usually such projects start by requiring the original game's data, and then a free/libre replacement data set is created by the community.
In some rare cases, the author of a recreation received permission from the copyright holders of the emulated game to use original proprietary game data, characters, title etc. These projects are marked with the [authr] suffix in the list.
The Bard's Tale Construction Set
Command & Conquer: Red Alert
Digger (Windmill Software)
Flight Sim Toolkit
Transport Tycoon Deluxe
UFO: Enemy Unknown
3. Clones and remakes that faithfully recreate original mechanics
This is likely the most common type, with many projects being not only accurate reproductions of the original game mechanics, but often also trying to follow the original "look & feel" of their inspirations. At least some of these projects are motivated by the desire to create a FOSS alternative to a proprietary game for Linux users, or to fill in what is perceived as an empty niche for modern platforms.
Note that some of these games actually make rather drastic changes compared to the original titles they emulate, such as the transition to 3D graphics from 2D, or a cosmetic/thematic overhaul by using free software mascots as game characters for example.
Age of Empires
Battle Isle II
Command & Conquer
Duke Nukem 1
Forgotten Realms: Unlimited Adventures
The Great Giana Sisters
King's Quest series
Knights and Merchants
The Lords of Midnight
The Lost Vikings
Master of Monsters
Master of Orion
Panzer General II
Rise of the Triad
Sensible (World of) Soccer
The Settlers II
The Settlers of Catan
Sid Meier's Civilisation/Civilisation II
Sid Meier's Colonisation
Sonic the Hedgehog
Star Wars: TIE Fighter
Super Mario Bros.
Super Monkey Ball
Thief: The Dark Project
Warlords II Deluxe