Here is a list of all files with brief descriptions:

doxygen
sgct
correction
buffer.h
domeprojection.h
obj.h
paulbourke.h
pfm.h
scalable.h
sciss.h
simcad.h
skyskan.h
projection
cubemap.h
cylindrical.h
equirectangular.h
fisheye.h
nonlinearprojection.h
projectionplane.h
sphericalmirror.h
actions.h
baseviewport.h
callbackdata.h
clustermanager.h
commandline.h
config.h
correctionmesh.h
definitions.h
engine.h
error.h
font.h
fontmanager.h
format.h
freetype.h
image.h
joystick.h
keys.h
log.h
math.h
modifiers.h
mouse.h
mutexes.h
network.h
networkmanager.h
node.h
offscreenbuffer.h
opengl.h
openxr.h
profiling.h
projection.h
screencapture.h
sgct.h
shadermanager.h
shaderprogram.h
shareddata.h
statisticsrenderer.h
texturemanager.h
tinyxml.h
user.h
viewport.h
window.h