Here is a list of all files with brief descriptions:

body.hh
cartesian-product.hh
center-of-mass-computation.hh
collision-object.hh
configuration.hh
device-data.hh
device-sync.hh
device.hh
extra-config-space.hh
frame.hh
fwd.hh
gripper.hh
humanoid-robot.hh
joint-collection.hh
joint.hh
liegroup-element.hh
liegroup-space.hh
liegroup.hh
main-page.hh
pool.hh
simple-device.hh
special-euclidean.hh
special-orthogonal.hh
urdf/util.hh
util.hh
vector-space.hh