CoolReader Engine is fast and small cross-platform XML/CSS based rendering library for writing E-Book readers for desktops as well as for handheld devices. Supported e-book formats: FB2, TXT, RTF, TCR, HTML, EPUB, DOC, PDB.
CoolReader3 is e-book viewer based on CoolReader engine. There are
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versions with interface on QT and wxWidgets. Also, there is version for e-Ink based devices (like Jinke V3/V60, Pocketbook).
Android port is available on Android Market. [Less]