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HbFree is now @ SourceForge.net: http://hbfree.sourceforge.net

Introduction

HbFree is intended for simulation of radio frequency (RF) and microwave (MW) analog non-autonomous circuits under multi-tone excitations. It was developed for MW mixers and power amplifiers design.
Package contains free version of harmonic balance simulator program "HaBala", Spice-to-Habala translator "s2h" and a few utilities. It allows the following components to be used: R,L,C, transmission lines (lossless for now), V and I sources, Diodes and MESFETs. "HaBala" simulator implements piecewise harmonic balance technique with 2-D FFT to handle a few monocrome sources. Input language is very close to SPICE, output format is SPICE ASCII RAW.
"HaBala" simulator itself allows additional elements to be used: S- and Y- matrices of 2N-poles, strip- and microstrip transmission lines, some discontinuities. But these elements are not implemented in "s2h" translator and will be available later.