Calibre is a full-featured e-book management software, which provides a "one-stop" e-book solution and supports various file formats, including CBZ, CBR, CBC, CHM, EPUB, FB2, HTML, LIT, LRF, MOBI, ODT, PDF, PRC * *, PDB, PML, Rb and RTF. TXT format, and can be converted into epub, fb2, OEB, lit, LRF, mobi, PDB, PML, Rb, pdf, TCR and txt. In addition, it is a complete electronic library, including book management, format conversion, news, converting materials into e-books, and the synchronization function of e-book readers and integration into e-book readers. It can fully meet our e-book needs. Moreover, Calibre is free, open source code, cross-platform design, and can run in Widnows, OS X and Linux environments.