Pandoc has an EPUB3 writer. It renders latex math into MathML, which EPUB3 readers are supposed to support (but unfortunately still few do). Use pandoc -t epub3
to force EPUB3 output, as opposed to EPUB2 which is the default.
Of course, this isn't much help if you want EPUB2 output or target readers that don't support MathML. Then you could try using the --webtex
option, which will use a web service to convert the TeX to an image.