EPUB

Columns: Software | License | Platform | DRM formats supported | Notes
Kitabu | Proprietary | OS X | None | Supports ePub3 , ePub2 , Fixed layout | Kobo | Proprietary | Windows , OS X , Android , Apple iOS , Kobo eReader Software , | Adobe Content Server | Supports EPUB 2 and EPUB 3 | Lektz Readers | Proprietary | Web application , Google Android , OS X , iOS , Windows | Lektz | eBook Readers for PDF , ePUB/2 and ePUB3 providing uniform experience across different platforms - iOS , Android , Windows PC , Mac Desktop and Web | Lucifox | GPL | Windows , OS X , Linux | None | Ebook reader add-on with annotations for Firefox . Supports open standard ebooks in EPUB 3- and EPUB 2 format and retrieval of books from OPDS book catalogues | Okular | GPL | Windows , OS X , Linux | unknown | Readium | BSD | All web browsers and all platforms | Multiple-DRM implementations | Exists as a cross-browser solution for embedding in users websites ( Readium CloudReader ) , a Chrome extension and a cross-platform SDK | Snapplify | Proprietary | All Web browsers , Apple iOS , Android | Adobe Content Server Snapplify SnappSafe DRM | Supports downloading purchased books as ePub and/or PDF . Supports PDF , ePUB2 and ePUB3 standard of ebooks | STDU Viewer | Freeware | Windows | Supports many documents format including ePub | Sumatra PDF | GPL | Windows | Adobe Content Server | Supports ePub for devices

Example questions:
What is the DRM format for the EPUB reading software formerly known as iBooks ? | What is the platform for the EPUB reading software originally written for the Sharp Zaurus ? | Who originally wrote the license for the EPUB reading software calibre ? | What is the license of the EPUB reading software that supports PostScript files if Ghostcript is installed ?

Answers:
Fairplay | PDAs | Richard Stallman | GPL