Serpent 3D is a first-person-eater.

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Developer: serpent3d
License: GNU General Public License (GPL)
Operating System: 32-bit MS Windows (NT/2000/XP), Linux

First person shooter featuring single *and* multi-player modes (via JGroups) for your 3D capable Java phone (J2ME, MIDP 2.

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Developer: battlephone
License: GNU General Public License (GPL)
Operating System: OS Independent (Written in an interpreted language)

Codename: X-Phase is a simple online first person shooter with random generated maps and landscape deformation, written in Java and OpenGL (LWJGL).

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Developer: x-phase
License: GNU General Public License (GPL)
Operating System: Linux, OS X, Vista, Win2K, WinXP

Paintball2 is a fast-paced first-person game with capture the flag, elimination, siege, and deathmatch (free-for-all) styles of gameplay.

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Developer: digitalpaint
License: GNU General Public License (GPL)
Operating System: 32-bit MS Windows (NT/2000/XP), All 32-bit MS Windows (95/98/NT/2000/XP), Linux, Win2K, WinXP

Aleph One is an open-source descendant of Bungie's _Marathon 2_ first-person 3D shooting game.

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Developer: marathon
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, Apple Mac OS Classic

The Retribution Engine is designed for first person action games on Windows PCs using OpenGL.

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Developer: retribengine
License: GNU General Public License (GPL)
Operating System: All 32-bit MS Windows (95/98/NT/2000/XP)

Ogrian Carpet is an outdoor First Person Shooter game with Real Time Strategy elements, inspired by the game 'Magic Carpet,' using Ogre3D as the renderer.

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Developer: ogrian
License: GNU General Public License (GPL)
Operating System: All 32-bit MS Windows (95/98/NT/2000/XP)