TEBookConverter

TEBookConverter is an easy-to-use ebook converter that uses Calibre. The supported input formats are CBZ, CBR, CBC, CHM, DJVU, DOCX, EPUB, FB2, HTML, HTMLZ, LIT, LRF, MOBI, ODT, PDF, PRC, PDB, PMML, RB, RTF, SNB, TCR, TXT, TXTZ.

The supported output formats are AZW3, EPUB, FB2, OEB, LIT, LRF, MOBI, HTMLZ, PDB, PML, RB, PDF, RTF, SNB, TCR, TXT, TXTZ. You can convert ebooks fast thanks to multithreading.