# Popular required libraries

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- **[Allegro](allegro.md)** (C, zlib, mature)
- **[Boost (C++ Libraries)](boost.md)** (C++, [BSL-1.0](https://github.com/boostorg/boost/blob/master/LICENSE_1_0.txt), mature)
- **[Crypto++](crypto.md)** (C++, Boost-1.0)
- **[Doxygen](doxygen.md)** (C++, GPL-2.0, mature)
- **[FreeType](freetype.md)** (C, GPL, mature)
- **[HarfBuzz](harfbuzz.md)** (C++, MIT, mature)
- **[LZMA SDK](lzma.md)** (C, LGPL-2.0, mature)
- **[Libxml2](libxml2.md)** (C, MIT, mature)
- **[Lua](lua.md)** (C, MIT, mature)
- **[Open AL](openal.md)** (Proprietary since v1.1, LGPL before)
- **[Open AL Soft](openalsoft.md)** (C, LGPL-2.0)
- **[OpenSSL](openssl.md)** (C, [Dual licensed under special licenses](https://github.com/openssl/openssl/blob/master/LICENSE), mature)
- **[Pthreads-win32](pthreads_win32.md)** (C, LGPL-2.1, mature)
- **[Ragel](ragel.md)** (C++, MIT, mature)
- **[SWIG](swig.md)** (C++, [Special](https://raw.githubusercontent.com/swig/swig/master/LICENSE), mature)
- **[Simple DirectMedia Layer](sdl_2.md)** (C, zlib, mature)
- **[Simple and Fast Multimedia Library](sfml.md)** (C++, zlib (core), mature)
- **[XZ Utils](xz.md)** (C, Different, see file Copying, liblzma is public domain, mature)
- **[libpng](libpng.md)** (C, [libpng](https://sourceforge.net/p/libpng/code/ci/master/tree/LICENSE), mature)
- **[pkg-config](pkgconfig.md)** (C, GPL-2.0, mature)
- **[wxWidgets](wxwidgets.md)** (C++, Objective C, Special, mature)
- **[yaml-cpp](yaml_cpp.md)** (C++, MIT)
- **[zlib](zlib.md)** (C, zlib, mature)

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