AzerothCore uses (parts of or in whole) the following opensource software:

argon2 (The password hash Argon2)
  https://github.com/P-H-C/phc-winner-argon2
  Version: 62358ba

Boost (external)
  http://www.boost.org
  Version: external

bzip2 (a freely available, patent free, high-quality data compressor)
  http://www.bzip.org/
  Version: 1.0.6

G3D (a commercial-grade C++ 3D engine available as Open Source (BSD License)
  http://g3d.sourceforge.net/
  Version: v9.0 hotfix7

gperftools (Google Performance Tools)
  Version: external

jemalloc (a general-purpose scalable concurrent malloc-implementation)
  http://www.canonware.com/jemalloc/
  Version: 5.2.1

jsonpath (JSONPath implementation in Bash for filtering, merging and modifying JSON)
  https://github.com/mclarkson/JSONPath.sh.git
  Version: 0.0.14

libMPQ (a library for reading MPQ files)
  https://libmpq.org/
  Version: 0.4.2

libreadline (command line editing library)
  https://cnswww.cns.cwru.edu/php/chet/readline/rltop.html
  Version: external

OpenSSL (general-purpose cryptography library)
  https://www.openssl.org/
  Version: external

MySQL (the world's most popular open source database software)
  http://www.mysql.com/
  Version: external

semver_bash (bash parser for semantic versioning)
  https://github.com/cloudflare/semver_bash/tree/master
  Version: c1133faf0efe17767b654b213f212c326df73fa3

SFMT (SIMD-oriented Fast Mersenne Twister)
  Based on http://agner.org/random/
  Version: 1.5

sse2neon (A translator from Intel SSE intrinsics to Arm/Aarch64 NEON implementation)
  https://github.com/DLTcollab/sse2neon
  Location: deps\argon2\argon2\blake2\sse2neon.h
  Version: 0c0dee02bb9d9848c294db1179fc278a4649979d

stdfs (filesystem library)
  Version: external

threads
  Version: external

utf8-cpp (UTF-8 with C++ in a Portable Way)
  http://utfcpp.sourceforge.net/
  Version: 2.3.4

zlib (A Massively Spiffy Yet Delicately Unobtrusive Compression Library)
  http://www.zlib.net/
  Version: 1.3.1

gSOAP (a portable development toolkit for C and C++ XML Web services and XML data bindings)
  http://gsoap2.sourceforge.net/
  Version: 2.8.105

recastnavigation (Recast is state of the art navigation mesh construction toolset for games)
  https://github.com/memononen/recastnavigation
  Version: c40188c796f089f89a42e0b939d934178dbcfc5c

{fmt} is an open-source formatting library providing a fast and safe alternative to C stdio and C++ iostreams.
  https://github.com/fmtlib/fmt
  Version: 7.1.3

fkYAML (A C++ header-only YAML library)
  https://github.com/fktn-k/fkYAML
  Version: 721edb3e1a817e527fd9e1e18a3bea300822522e
