My Visual Database - Using My Visual Database, you can create databases for invoicing, inventory, CRM, or any specific purpose.
calibre - Ebook manager, viewer & converter
LibreOffice - Base - Base, database, database frontend, LibreOffice, ODF, Open Standards, SQL, ODBC
FBReader - FBReader is an e-book reader for various platforms. Features:
Kexi - Kexi | Calligra Suite
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.