OSRIC is a non-copyright infringing clone of First Edition AD&D, often refered to as a
retroclone in the old school pen and paper RPG community. There are a
number of such systems, but OSRIC is my personal favorite. Unlike some
of the others, OSRIC is fully AD&D compatible and doesn't attempt to
modernize any of AD&D's original conventions. You can
download a free PDF of the OSRIC system
at Knights & Knaves.
Although OSRIC is a complete AD&D compatible game system, it is
lacking in at least one area. OSRIC does not have a psionics
system. It is my aim to rectify that with an OSRIC psionics system of
my own. In keeping with OSRIC's purpose, my goal is to clone the AD&D
psionics system as closely as possible.