物理Engine

novodex
http://www.novodex.com/

ode
http://ode.org/

Tokamak
http://www.adamdawes.com/programming/tokamak/index.html

Newton
http://www.physicsengine.com/

OPCODE
http://www.codercorner.com/Opcode.htm

flade (flash)
#http://www.cove.org/flade/

物理引擎国人作的
http://blog.gameres.com/show.asp?BlogID=747&column=0

声音

openal
http://www.openal.org/

openal++
http://alpp.sourceforge.net/
http://sourceforge.net/projects/alpp/

人工智能
http://openai.sourceforge.net/
http://sourceforge.net/projects/openai/

3D Engine

blender
http://www.blendercn.org/
http://www.deathblood.net/main/tutorial/
http://www.blenderart.org/index.html
http://bbs.blendercn.org/viewtopic.php?t=183 FTP
http://www.blendercn.org/download/blenderwiki/ Blender手册(From wiki.blendercn.org)
http://www.blendercn.org/download/tutorials/ 基础视频教程
http://www.blendercn.org/download/blendercn/ Blender中文版
http://www.blendercn.org/download/yafray/ Yafray渲染器
http://www.blendercn.org/download/blenderart/blenderart_mag-1.zip Blenderart杂志
http://www.blendercn.org/download/blenderart/blenderart_mag-2.zip
http://www.blendercn.org/download/blendersc/ Blander源代码编译环境
http://code.google.com/p/wpyre/ 分布式渲染
http://www.softlab.ece.ntua.gr/~jpanta/Graphics/Kerkythea/ 场景编辑器，带材质编辑器

klayGE
http://klayge.sourceforge.net/ 中国人做的引擎.粘土

Axiom
http://axiomengine.sourceforge.net/ c#版的OGRE

CAL3D
http://sourceforge.net/projects/cal3d/ 骨骼动画引擎

OGRE
http://www.ogre3d.org/
http://ofusion.inocentric.com/
http://chronos.digitalsentience.com/

Irrlicht
http://irrlicht.sourceforge.net/ 官方
http://www.irrlicht3d.org/ 作者blog
http://irredit.irrlicht3d.org/ 场景编辑器
http://www.gdtoolkit.8m.net/ toolkit
http://irrlichtnetcp.sourceforge.net/ .net包装
http://irrklang.irrlicht3d.org/ irr配套的声音库和编辑器
http://irrlichtitalia.altervista.org/start/
http://46577.rapidforum.com/area=11
http://flysnow.cnblogs.com/

mesa3d
http://www.mesa3d.org/

Crystal Space 3D SDK
http://www.crystalspace3d.org/

GUI

CEGUI
http://www.cegui.org.uk/

CEGUI#
http://ceguisharp.sourceforge.net/ CEGUI C#版

通信引擎

raknet
http://www.rakkarsoft.com/ 开原的网络引擎,商用收费

enet
http://enet.cubik.org/ udp可靠传输

tnl
http://www.opentnl.org/ torque network library

udt
http://udt.sourceforge.net/

Sockets Lib
http://www.alhem.net/Sockets/

hawk
http://www.hawksoft.com/

linux upnp sdk
http://sourceforge.net/projects/upnp/

脚本

天使脚本引擎,类c
http://www.angelcode.com/

游戏引擎

Truevision3D
http://www.truevision3d.com/ 不开源，支持多种语言

Nebula 2
http://sourceforge.net/projects/nebuladevice
http://nebuladevice.cubik.org/

NeoEngine
http://www.neoengine.org/

Fly3D
#http://www.fly3d.com.br/
http://fabio.policarpo.nom.br/fly3d/

OpenSceneGraph
http://www.physicsengine.com/

RealmForge
http://www.visual3d.net/ 官方
http://sourceforge.net/projects/realmforge 项目地址

clan
#http://www.clanlib.org/