FBReader is a reliable ebook reader. It’s available for iPhone, iPad, Android and Mac OS.
The free version only allows a total of ten books in your library. Upgrade allows unlimited books for $4.
Supported e-book formats are:
- ePub — an international e-publishing standard.
- fb2 — a Russian e-books standard format
- Non-DRM’d version of Mobipocket — a popular commercial e-book format
- Some subsets of RTF and MS Word Doc
Another Option: KyReader
KyReader 3 is another ebook reading app for iOS. It also has extensive ePub format support.
Other formats supported:
- FictionBook (fb2, fb2.zip)
- Plain and rich text (txt, rtf)
- PDF (DRM-free)
- Comic Book (cbr, cbz, cbt)
- MobiPocket and Kindle (mobi, azw3)
- Audio Book (mp3, m4a, m4b)
PDF/DJVU specific features
- Crops page margins in manual or automatic mode
- Smart zooming by double-tap
- PDF Reflow on iPhone
- Page text recognition (OCR)