It is an online file conversion service, covering a wide range of different image, document, music, video and compression formats. Free for files up to 100MB. Read more »
Calibre is a free and open source e-book library management application. It can convert from a huge number of formats to a huge number of formats. The conversion engine has lots of powerful features. It can rescale all font sizes, detect/create book structure, insert the book metadata, etc. Read more »
Mac OS X, Windows 7, Windows Vista, Linux, Windows XP.
Jomic is a comic book viewer and converter for Mac OS X. Jomic converts from CBR to PDF or CBZ, and from PDF to CBZ. The software can be installed on Windows and Linux, but is not user friendly in these operating systems. Read more »