asio - Boost Software License
asmjit - zlib license
benchmark - Apache License, Version 2.0 (used only for testing, not part of distribution)
bgfx - The BSD 2-Clause License
bimg - The BSD 2-Clause License
catch - Boost Software License
compat - Wine headers missing in MinGW The GNU Lesser General Public License, version 2.1 (LGPL-2.1)
note that this one contain headers only and that real library/dll is dynamically loaded so use in commercial project is allowed, will be removed when becomes part of MinGW distribution
dxsdk - DirectX SDK EULA
expat - The MIT License (MIT)
genie - The BSD 3-Clause License
glm - The MIT License (MIT)
libflac - The BSD 3-Clause License (codecs), The GNU General Public License, version 2
libjpeg - Custom BSD-like
linenoise - The BSD 2-Clause License
lsqlite3 - The MIT License (MIT)
lua - The MIT License (MIT)
lua-linenoise - The MIT License (MIT)
lua-zlib - The MIT License (MIT)
luafilesystem - The MIT License (MIT)
lzma - Custom public domain license
minimp3 - Creative Commons Zero v1.0 Universal
nanosvg - zlib license
portaudio - The MIT License (MIT) explanation at their site
portmidi - The MIT License (MIT)
pugixml - The MIT License (MIT)
rapidjson - The MIT License (MIT), The BSD 3-Clause License (msinttypes), JSON license (JSON_checker)
softfloat - "Softfloat 2b" U.C. Berkeley modified license MIT compatible
softfloat3 - The BSD 3-Clause License
sol2 - The MIT License (MIT)
sqlite3 - Custom public domain license
tap-windows6.h - Dual-licensed The GNU General Public License, version 2 and The MIT License (MIT)
utf8proc - The MIT License (MIT)
wdlfft - zlib license
zlib - zlib license