FBReader

FBReader is a free e-book reader for Unix/Windows computers and mobile devices.

Supported formats are

- fb2 e-book format (style attributes are not supported yet).
- HTML format (tables are not supported).
- CHM format (tables are not supported).
- plucker format (tables are not supported).
- Palmdoc (aportis doc).
- zTxt (Weasel format).
- TCR (psion text) format.
- RTF format (stylesheets and tables are not supported).
- OEB format (css and tables are not supported).
- OpenReader format (css and tables are not supported).
- Non-DRM'ed mobipocket format (tables are not supported).
- Plain text format.

More information is available here.