unbook is a command-line program for converting a DRM-free .epub, .mobi, .azw, .azw3, .lit, or .chm ebook to a self-contained HTML file, which you can read in any browser. unbook functions as a frontend for Calibre's HTMLZ functionality and performs some CSS repair to make things easier to read.
For more information, including installation and usage, please see
(please link there instead of GitHub.)
Please do report issues on GitHub, especially for things that prevent you from using unbook at all.
Security bugs can be reported like regular bugs.
If you distribute an unbook binary you've compiled, remember to include THIRDPARTY.html in your distribution.