Adonthell is a single player RPG that combines the best features of the Final Fantasy and Ultima series with an epic plot set in a detailed virtual world.

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Developer: adonthell.linuxgames.com
License: GNU General Public License (GPL)
Operating System: All POSIX (Linux/BSD/UNIX-like OSes), Linux, BeOS

xu4 is a recreation of the classic computer RPG Ultima IV for modern operating systems.

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Developer: xu4
License: GNU General Public License (GPL)
Operating System: All 32-bit MS Windows (95/98/NT/2000/XP), All POSIX (Linux/BSD/UNIX-like OSes), OS X

An easily modified text based RPG written in C++ created to help teach new programmers how to break apart parts of a game into something creatable.

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Developer: wrathlands2
License: GNU General Public License (GPL)
Operating System: WinXP

Korax' Heritage is an ongoing project to create a new 3D action-RPG engine based on the original Hexen source code (DOOM engine), providing OpenGL/Direct 3D acceleration, new single- and multiplayer modes, lots of RPG features, new enemies, spells, etc.

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Developer: korax-heritage.com
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, MS-DOS

Empty Clip is a top-down, 2D Action RPG.

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Developer: emptyclip
License: GNU General Public License (GPL)
Operating System: Linux, WinXP

Crossfire is an open source, cooperative multiplayer graphical RPG and adventure game.

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Developer: real-time.com
License: GNU General Public License (GPL)
Operating System: 32-bit MS Windows (NT/2000/XP), All POSIX (Linux/BSD/UNIX-like OSes)

PCGen is a RPG character generator and maintenance program (d20 sytems).

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Developer: pcgen.sourceforge.net
License: GNU Lesser General Public License (LGPL)
Operating System: OS Independent