Vancouver's own digital publishing services company Wundr announced on Wednesday of last week that it was launching a new Mac-only Epub3 creation tool.
According to the press release, Playwrite offers an easy-to-use interface and powerful toolset with a WYSIWYG interface that cuts down on the work required to produce an Epub3 ebook.
Authors can choose from prepared style templates, including novel, textbook, academic journal, and more. They can easily add video, audio, and images simply by dragging and dropping the files.
The app integrates with Upub, Wundr's distribution platform, enabling authors to create a single file and upload it to all of the major ebookstores, including Kindle, iBooks, Kobo, and Google Play. Authors can then manage their ebook across the stores, including adjusting the price, suspending a listing, and updating the metat data.
While there's a plenitude of apps for creating Epub ebooks, the ones which also boast of making Epub3 files are rather thin on the ground. I only know of one, PubCoder; it launched in December 2014. (And of course there is Adobe Indesign.)
You can find Playwrite in the Mac App Store. It costs $50.