The downloadble version is available for Windows and will be soon made available for Linux too.
Some of the features of NHM converter are:
1. Embedded fonts. You don’t need to install any fonts.
2. Speed of the conversion as conversion takes place at client side. We used NHM converter for the Tamil Wiktionary Automation project and it helped us convert font encoding of large MB files with ease.
3. Auto detect encoding
5. Sometimes it will be helpful, if you want to type in a 8 -bit encoding without any font. (another usage of font embedding feature)