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很强大的电子书阅读器，支持Windows，Linux和MacOSX
支持多种电子书格式，同时可以进行电纸书格式转换：
calibre supports the conversion of many input formats to many output formats. It can convert every input format in the following list, to every output format.
Input Formats: AZW, AZW3, AZW4, CBZ, CBR, CBC, CHM, DJVU, DOCX, EPUB, FB2, HTML, HTMLZ, LIT, LRF, MOBI, ODT, PDF, PRC, PDB, PML, RB, RTF, SNB, TCR, TXT, TXTZ
Output Formats: AZW3, EPUB, DOCX, FB2, HTMLZ, OEB, LIT, LRF, MOBI, PDB, PMLZ, RB, PDF, RTF, SNB, TCR, TXT, TXTZ, ZIP
Ubuntu下安装方法：
sudo apt-get install calibre
