XCHM
xCHM is a free and open-source GUI front-end for CHMLIB (a viewer for Microsoft Compressed HTML Help files). It compiles and runs on Linux, BSD, Mac OS X and Microsoft Windows. Pre-built binaries for Mac OS X and Microsoft Windows are usually available for download from the project's website. References

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Technical communication
Free software programmed in C++
Free system software
Software that uses wxWidgets