BlueGriffon EPUB3 Validator
I am glad to report my EPUB3 Validator add-on to Firefox is now available. A few details about it:
- not based on epubcheck's code at all, no Java code, does not rely on Java at all
- my own xml content model validator
- my own CSS parser and CSS Profile validator
- Firefox >=12
- Mac OS X, Windows, Linux
- Free upgrades for life after purchase.
More information there.