This document is a collection of delay, neutral and functional
differential equations (mostly with analytical solutions) taken from the
mathematical literature. Also included is the original source of the equation,
and other useful information. Further test equations are welcomed, and
will appear in the anonymous ftp version of this document. The reference
solutions quoted were obtained using an explicit fifth-order continuous
Runge-Kutta method based on the fifth-order Dormand & Prince method
with a Hermite interpolant.