Free general dynamics software for mac

Crystal Space is a free cross-platform software development kit for realtime 3D graphics, in particular games.
Main features:>
Generic
- Highly platform independent with good platform abstraction. Officially supports Linux, OSX and Windows using a wide range of compilers.
- Modularized using a lightweight component framework, SCF, based upon the COM model.
- Self contained so that many modules requires no or few external dependencies.
- Written in standard C++ using very few non*standard extensions. Source available under LGPL license.
Comprehensive and competent
- Contains modules for 2d and 3d graphics, sound, collision detection and dynamics via ODE and bullet as well as support modules for filesystem abstraction, xml loading etc.
- Graphics subsystem:
- Generic renderer abstraction with main implementation being OpenGL based.
- Supports hardware accelerated rendering on all supported platforms and cards from all well known vendors.
- OpenGL renderer uses acceleration techniques such as vertex buffers in AGP or VRAM and asyncronious uploads.
- Shader centric design with shaders defined in xml markup and shader programs implemented using Cg, assembly language or fixed function operations.
- Complicated shaders can be constructed using a meta syntax as composed by simpler modules that gets combined on load.
- Library of common shaders such as normal mapping, parallax (virtual displacement) mapping and hardware skinning.
- Contains a software renderer with scaled down features for platforms without OpenGL and/or debugging.
- Mesh objects:
- Plugin based mesh object system
- Generic triangle based mesh with support for frame and bone based animation.
- Terrain mesh with fast block based LOD system.
- Configurable and extensible particle system mesh.
- General system for static LOD on all types of meshes.
- Bone based animation mesh using the cal3d library.
- Collision detection and dynamics:
- Provides bindings for ODE and bullet dynamics systems.
- Automatic setup of collision detection meshes and syncronization of position and orientation of meshes.
- Simplified collision detection when you dont need the full dynamics simulation
- Sound system:
- 2D and 3D sound rendering via DirectSound, Alsa, OSS and CoreAudio.
- Provides both one*time playing of effects and streaming playing in the background for music.
- Other:
- Filesystem abstraction layer, VFS, that handles both physical files on disk and files within ZIP files, giving virtual layout independent from platform and physical layout.
- Abstracted configuration layer with support for settings in configuration file, system dependent storage such as the registry and command line.
Compatible
- Custom model and scene file format with exporters for Blender and 3d studio max and model importers for common file formats such as 3ds and md2.
- Supports all common texture file formats including dds, jpg, png as well as some more exotic ones such as mng (animated texture format).
- Sound loaders for wav and ogg formats.
- All subsystems easily extendable for new file formats.

Enhancements:
- fixes for some compilation warnings.
- fixes and enhancements for TinyXML and xmlread.
- fixes for dynavis, sprcal3d, odedynam, genmesh, shaders, LeakGuard and RB tree.
- fix for dynamic lights not shining on certain objects.
- fix for TinyXML writer crashing on empty attributes.
- fix for setting priority on a non-running thread having no effect.
- fix for UTF-8 BOM tripping up XML parser.
- fix for terrain2 not setting SplatDistance.
- fix for csperl5 plugin build error on amd64.
- fix for csInputDefinition::ParseKey() considering non-keyboard definitions.
- fix for some sndsys parts not being under LGPL.
- fix for light attenuation vector update after cutoff distance change.
- fix for mouse and joystick event helpers not using csKeyModifiers.
- fix for xmlshader conditions.
- fix for DDS cubemap saving.
- fix for wrong refCount on materials.
- fix and optimization for opcode/CollideRay.
- work-around crashes on exit with static profile builds.
- castle textures split, licensing.
- leak fixes...
- removal of some old unused cruft from the Jam build system
- work-around internal Jam crasher.
- work-around g++ -Wno-long-double bug for recent compilers.
- fix for cross-compile problem with -fvisibility-inlines-hidden.
fix broken folding of multi-token build switches, for example:
- "-framework Foo -framework Bar" being incorrectly mutated to "-framework FooBar".
- fix missing dependency in cs-config/Jamfile.
- fix for incorrect declaration of pycscegui clean target.
- fix for SWIG 1.3.31+ required for python 2.5 bindings.
- fix for detection of python installation in non-standard locations.
- fix for augmenting pkg-config path with user-specified dir.
- fix for vertexlight.cgvp not getting installed.
- loads of other clean-ups, fixes and improvements...
- fix for lighter2 related to lighting through portals.
- fix for a crasher in basemapgen.
- fix for startme not handling spaces in paths to the called applications.
- fix for viewmesh mouse events.
- updates for links for PSDK with VC8 Express.
- updates for URLs and FAQ.
- updates for sound system documentation.
- fix for crash in the Alsa driver at exit.
- re-enable VBO for ATI driver 2.1.7059+.
- work-around driver-brokenness for Intel GMA 950 & 3100 texture compression.
- fix binutils check for Mac OS X Leopard.
- fix for MacOS X enter raw-key-code.
- fix for CoreAudio driver.
- fix libcrystalspace_staticplugins failing to compile in MSVC8 due to pycscegui.