ABC Amber CHM MergerScreenshot
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. The software supports more than 50 languages and can be run from a command line. Important note: the program is able to merge CHM files that don`t have a HHC (Table of Contents).