Some files in the src directory are in the public domain or freely redistributable. Copyright belongs to their respective authors, and is marked in the files.
Public domain hash function (c) by Bob Jenkins:
jenkins.c
jenkins2.c
Special functions from the Cephes math library (c) by Stephen L. Moshier:
mconf.h
mtherr.c
igam.c
gamma.c
const.c
polevl.c
isnan.c
ndtr.c