Hello,
I post here the library or Engine that may be possible to be usefull for Constrcut and hope it can help out :
Engine :
-Horde3D
-G3D
-BlendElf
-Freetype
-ODE
-Box2D
-OgreAL
Library :
-OpenKode
-OpenAL
-SDL
-SDL_net
-Wxwidget
Hope you guy find it usefull, since i search in hope to help out .