These are the third party libraries used by MuPDF.

Library | Version | Function | License
--- | --- | --- | ---
Required:
freetype | 2.6.3 | Font scaling and rendering | BSD-style
harfbuzz | 1.3.2 with patches | Text shaping | MIT-style
libjpeg | 9.0 with patches | JPEG decoding | BSD-style
openjpeg | 2.1.0 with patches | JPEG 2000 decoding | BSD-style
zlib | 1.2.7 | Deflate compression | zlib License
Optional:
FreeGLUT | 3.0.0 with patches | OpenGL API for UI | MIT-style
curl | 7.51.0 with patches | HTTP data transfer | MIT-style
Luratech JP2 | N/A | JPEG 2000 decoding | commercial
Luratech JBIG2 | N/A | JBIG2 decoding | commercial
JPEG-XR reference | 1.8 with patches | JPEG-XR decoding | special

NOTE: jbig2dec and MuJS are included in "thirdparty" but are copyright Artifex Software Inc.