This looks like quite a good one, especially if you get it from Giveaway of the Day ( <img src=/S/free.gif border=0 alt=free width=30 height=15> for the next 18 hours). From the homepage :

CHM Editor is a handy WYSIWYG editor which can be used for editing and translating CHM files. You can translate your e-Books in CHM format easily and quickly. Besides, this is perfect tool for localization your CHM Help files. You can solve several tasks at once by using CHM Editor:

This is a powerful tool for editing CHM, you can change and save chm file without downloading any additional tools or editors.

It allows you translate any chm-file using one of available translation services.

The most amazing thing is that translation will be complied with saving of all html-tags and document's structure - did you ever dream about such powerful feature? CHM Editor's features are the best choice both for average PC users when they need to read chm-help in foreign language and for professional translators who could get possibility to translate chm-files as usual document without any knowledges about HTML.

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Alan