Dungeon

YAD is "Yet Another Dungeon-game.

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Developer: yadgame
License: GNU General Public License (GPL)
Operating System: All POSIX (Linux/BSD/UNIX-like OSes)

Dungeon Master Nintendo DS port (for playing DM, CSB and DM2 on NDS).

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Developer: dmds
License: Open Software License
Operating System: Console-based Platforms

Egoboo is a working cool 3D dungeon crawling game in the spirit of nethack.

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Developer: egoboo
License: GNU General Public License (GPL)
Operating System: 32-bit MS Windows (95/98), All 32-bit MS Windows (95/98/NT/2000/XP), All POSIX (Linux/BSD/UNIX-like OSes), Linux, OS X

Dungeon Crawl Stone Soup is a free rogue-like game of exploration and treasure-hunting.

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Developer: crawl-ref
License: GNU General Public License (GPL)
Operating System: All 32-bit MS Windows (95/98/NT/2000/XP), All BSD Platforms (FreeBSD/NetBSD/OpenBSD/Apple Mac OS X), Linux, OS X, MS-DOS

NetHack is a single player dungeon exploration game that runs on a wide variety of computer systems, with a variety of graphical and text interfaces all using the same game engine.

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Developer: Stichting Mathematisch Centrum and M. Stephenson
License: GNU General Public License (GPL)
Operating System: OS Independent

Ularn is a "rogue-like" game.

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Developer: ularn
License: GNU General Public License (GPL)
Operating System: OS Portable (Source code to work with many OS platforms)

Mikes Adventure Game is a mature 1980s roguelike RPG game like Nethack, rogue, moria, angband, dungeon crawl, hack and Adom.

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Developer: mikesadvgame
License: GNU General Public License (GPL)
Operating System: 32-bit MS Windows (NT/2000/XP), MS-DOS

MySource is a powerful, open source website and intranet content publishing and management system.

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Developer: Squiz.net
License: Freeware
Operating System: PHP/MySQL able webserver