openGL for hardware accelerated graphics
openAL for cross platform 3D audio
fbgfx lib for software rendering
ODE gravity, friction, etc
LUA for scripting
FBC to compile the source for windows and linux
Which features will the engine have?
shaders to speed things up with modern GPUs
cpu/gpu skinning because we need animations
physics to make games more immersive
particles snow/rain/fire/smoke, you name it!
dynamic LOD for more performance
sound so you can listen to music/sound effects
fontsets you have a bitmap with fonts? Let's use it!