see the plugins/ directory

each plugin .c file should contain a function PF_FUNCTION(pf_plugin_setup),
usually at the bottom of the file, which exports the functions to forth. you
could use that as a reference doc until there is a decent one.

The current list is:

working:

console 	readline console
fbcon		framebuffer and linux console
gsl		GNU Scientific Library (used for matrix type and operations)
image		image processing core. uses libtile and some native pf functions.
lqt     	libquicktime movie i/o
opengl		drawing functions using opengl (used for texture packet)
v4l		video4linux
FreeType	font rendering using freetype
gmp		GNU MultiPrecision library. for number-theoretic weirdness.
SDL		Simple Direct media Layer.
X11		X Window specific output objects for xvideo and glx
jpeg		jpeg image load/save
png		png image load/save

experimental:

ascii		ascii packet (rectangular text buffer) and stuff
glade		run a glade gui from packet forth
net		network stuff (obsolete)
guile		scheme bindings for pf
jack		jack audio daemon. only used for synchronization
octave		interface to octave. broken.