FBReader is a e-book reader, it can be downloaded on Ubuntu Software Center by searching "FBReader".
web site: http://www.fbreader.org/
Main features:
- supports several open e-book formats: fb2, html, chm, plucker, palmdoc, ztxt, tcr (psion text), rtf, oeb, openreader, non-DRM'ed mobipocket, plain text, epub, eReader
- reads directly from tar, zip, gzip, bzip2 archives (you can have several books in one archive)
- supports a structured view of your e-book collection
- automatically determines encodings
- automatically generates a table of contents
- keeps the last open book and the last read positions for all open books between runs
- automatic hyphenation (patterns for several languages are included)
- searching and downloading books from www.feedbooks.com and www.litres.ru
- partial CSS support for epub files
FBReader support Android also. Link to Android Market
