CoolReader 3.X is free open-source (GPL) multiplatform version under active development.
Windows (Qt based GUI)
Linux (Qt based GUI)
Embedded versions: for e-Ink based devices. Used in Jinke/LBook V3/V5/V3+/V60, Azbooka N516, Pocketbook
Symbian port (SmartReader)
Common features, for all platforms
epub (non-DRM), fb2, txt, rtf, html, chm, tcr, doc, pdb formats supported
Pages or scroll view
Table of contents
Most complete FB2 format support: styles, tables, footnotes
Additional fonts support (.ttf)
Can read books from zip archives
Automatic reformatting of .txt files (autodetect headings etc.)
Styles can be customised in wide range using external CSS
Cool Reader Windows CoolReader 2.X is stable version with skinning and text-to-speech support. For Win32 only. Development is frozen.
Cool Reader is an e-book viewer.
Understands a number of text document formats