CoolReader is fast and small cross-platform XML/CSS based eBook reader for desktops and handheld devices. Supported formats: FB2, TXT, RTF, DOC, TCR, HTML, EPUB, CHM, PDB, MOBI.

Features:

• Read electronic books in FB2, TXT, RTF, DOC, TCR, HTML, EPUB, CHM, PDB, MOBI formats
• Stylesheet support
• A lot of customizations for better reading performance