9 open-source E-books projects

E-books (File Formats): open-source projects that exist because someone reverse engineered a closed product, sorted by GitHub stars.

1. calibre★ 26,264 · active · Python

   E-book manager with readers for many proprietary formats (MOBI, LIT, LRF, PDB, KFX via plugin)

2. kepubify★ 899 · active · Go

   Standalone EPUB to Kobo KEPUB converter replicating Kobo's own conversion

3. libmobi★ 487 · slowing · C

   C library for handling Kindle MOBI/AZW3/KF8 e-book formats

4. fb2cng★ 84 · active · Go

   FB2 converter to EPUB, KEPUB and Kindle AZW8/KFX formats

5. mobi★ 78 · slowing · Python

   Python library to unpack Kindle (kindlegen) e-books

6. boko★ 69 · active · Rust

   Rust converter from EPUB to Kindle KFX, AZW3 and MOBI

7. KFX Output (mirror)★ 29 · dormant · Python

   Mirror of jhowell's calibre plugin that writes Kindle KFX books

8. kdegraphics-mobipocket★ 0

   Library for reading Mobipocket e-book files

9. libe-book★ 0

   Document Liberation library for legacy e-book formats (eReader, Plucker, TealDoc, LRF and more)