ABC Amber CHM Merger is an advanced free tool that actually merges CHM files. The combined CHM doesn't depend on the source CHMs, so you can use and distribute it without needing source CHM files.
This software is not reviewed yet.
ABC Amber ScrapBook Converter is an advanced utility which converts ScrapBook (Firefox extension) data to CHM format easily and quickly. The software allows you to convert all folders, starting from the selected folder or only selected folder.l