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Single-file public-domain/open source libraries with minimal dependencies

I am the author of a large number of single-file C/C++ public domain libraries. I am not the only person who writes libraries like this, so below are other, similar libraries.

Generally, the following is a list of small, easy-to-integrate, portable libraries which are usable from C and/or C++, and should be able to be compiled on both 32-bit and 64-bit platforms.

Rules

• Libraries must be usable from C or C++, ideally both
• Libraries should be usable from more than one platform (ideally, all major desktops and/or all major mobile)
• Libraries should compile and work on both 32-bit and 64-bit platforms
• Libraries should use at most two files

Exceptions will be allowed for good reasons.

New libraries and corrections

See discussion after the list.

JSON Parsing

There are a lot of JSON parsers listed here. For some analysis and performance results, check out https://github.com/miloyip/nativejson-benchmark

Other lists

Also you might be interested in other related, but different lists:

• clib: list of (mostly) small single C functions (licenses not listed)

Library listing

Public domain single-file libraries usable from C and C++ are in bold. Other libraries are either non-public domain, or two files, or not usable from both C and C++, or all three. Libraries of more than two files are mostly forbidden.

For the API column, "C" means C only, "C++" means C++ only, and "C/C++" means C/C++ usable from either; some files may require building as C or C++ but still qualify as "C/C++" as long as the header file uses extern "C" to make it work. (In some cases, a header-file-only library may compile as both C or C++, but produce an implementation that can only be called from one or the other, because of a lack of use of extern "C"; in this case the table still qualifies it as C/C++, as this is not an obstacle to most users.)

Categories:

• 2D graphics
• 3D graphics
• 3D geometry file processing
• AI
• argument processing
• audio
• compression
• cryptography
• data structures
• files and filenames
• hardware interfacing
• image loading, saving, & processing
• mathematics for geometry
• mathematics
• miscellaneous
• multithreading
• networking
• parsing
• profiling
• scripting
• string processing
• tests
• user interface
• video

AI

librarylicenseAPIfilesdescriptionmicropatherzlibC++2pathfinding with A*GenannzlibC/C++2simple neural networks (ANN)

argv

librarylicenseAPIfilesdescriptionpargpublic domainC1command-line argument parsing

audio

librarylicenseAPIfilesdescriptionaw_ima.hMITC/C++1IMA-ADPCM audio decoderdr_flacpublic domainC/C++1FLAC audio decoderdr_wavpublic domainC/C++1WAV audio loadersts_mixerpublic domainC/C++1simple stereo audio mixer

compression

librarylicenseAPIfilesdescriptionminiz.cpublic domainC/C++1compression,decompression, zip file, png writinglz4BSDC/C++2fast but larger LZ compressionfastlzMITC/C++2fast but larger LZ compressionpithyBSDC/C++2fast but larger LZ compressionmicrotarMITC/C++2lightweight tar library

crypto

librarylicenseAPIfilesdescriptionTweetNaClpublic domainC2high-quality tiny cryptography library

data structures

librarylicenseAPIfilesdescriptionklibMITC/C++2many 2-file libs: hash, sort, b-tree, etcuthashBSDC/C++2several 1-header, 1-license-file libs: generic hash, list, etcPackedArrayWTFPLv2C2memory-efficient array of elements with non-pow2 bitcountminilibspublic domainC2two-file binary tress (also regex, etc)DG_dynarr.hpublic domainC/C++1typesafe dynamic arrays (like std::vector) for plain Cchobo-shlMITC++1several C++11 standard contaner like libraries and helpers

files & filenames

librarylicenseAPIfilesdescriptionDG_misc.hpublic domainC/C++1Daniel Gibson's stb.h-esque cross-platform helpers: path/file, stringswhereamiWTFPLv2C/C++2get path/filename of executable or moduledirentMITC/C++1dirent for windows: retrieve file & dir infoTinyDirBSDC1cross-platform directory reader

geometry file

librarylicenseAPIfilesdescriptiontk_objfileMITC/C++1OBJ file loadertinyplypublic domainC++2PLY mesh file loadertinyobjloaderMITC++1wavefront OBJ file loadertinyobjloader-cMITC1wavefront OBJ file loaderyocto_obj.hMITC/C++1wavefront OBJ file loader

geometry math

librarylicenseAPIfilesdescriptionnv_voronoi.hpublic domainC/C++1find voronoi regions on lattice w/ integer inputssobol.hpublic domainC/C++1sobol & stratified sampling sequencessdf.hMITC/C++1compute signed-distance field from antialiased imagenanoflannBSDC++1build KD trees for point cloudsjc_voronoiMITC/C++1find voronoi regions on float/double datapar_msquaresMITC/C++1convert (binarized) image to trianglespar_shapesMITC/C++1generate various 3d geometric shapesTomas Akenine-Moller snippetspublic domainC/C++2various 3D intersection calculations, not lib-ifiedClipperBoostC++2line & polygon clipping & offsettingPolyPartitionMITC++2polygon triangulation, partitioningVoxelizerMITC/C++1convert triangle mesh to voxel triangle meshyocto_bvh.hMITC/C++1ray-casting and closest-element queries of bounding-volume hierarchyyocto_shape.hMITC/C++1shape generation, tesselation, normals, etc.rjmpublic domainC/C++1marching cubes triangulator

graphics (2d)

librarylicenseAPIfilesdescriptionblendishMITC/C++1blender-style widget rendering using NanoVGtigrpublic domainC/C++2quick-n-dirty window text/graphics for Windows and OSXnoc_turtleMITC/C++2procedural graphics generator

graphics (3d)

librarylicenseAPIfilesdescriptionyocto_trace.hMITC/C++1physically-based unidirectional path tracer w/ MIS for direct lightsyocto_symrigid.hMITC/C++1rigid body simulator (sequential impulse/PGS) with support for concave objectsmikktspacezlibC/C++2compute tangent space for normal mappingdebug-drawpublic domainC++1API-agnostic immediate-mode debug renderinglightmapperpublic domainC/C++1use your OpenGL renderer to offline bake lightmaps

hardware

librarylicenseAPIfilesdescriptionEasyTabpublic domainC/C++1multi-platform tablet input

images

librarylicenseAPIfilesdescriptionjo_gif.cpppublic domainC++1animated GIF writer (CPP file can also be used as H file)gif.hpublic domainC++1animated GIF writer (can only include once)tiny_jpeg.hpublic domainC/C++1JPEG encodergif_loadpublic domainC/C++1(animated) GIF readerminiexrpublic domainC++2OpenEXR writer, needs header filetinyexrBSDC/C++1EXR image read/write, uses miniz internallylodepngzlibC/C++2PNG encoder/decodernanoSVGzlibC/C++11-file SVG parser; 1-file SVG rasterizerpicopng.cppzlibC++2tiny PNG loaderjpeg-compressorpublic domainC++22-file jpeg compress, 2-file jpeg decompresseasyexifMITC++2EXIF metadata extractor for JPEG imagescro_mipmap.hpublic domainC/C++1average, min, max mipmap generatorsPDFgenpublic domainC2PDF writer

math

librarylicenseAPIfilesdescriptionmm_vec.hBSDC/C++1SIMD vector mathHandmade Mathpublic domainC/C++1vector mathgb_mathpublic domainC/C++1Vector, quaternion and matrix math w/o math.hccVector.hpublic domainC/C++1Vector, quaternion and matrix mathShaderFastLibsMITC++1(also HLSL) approximate transcendental functions optimized for shaders (esp. GCN)TinyExprzlibC2evaluation of math expressions from stringslinalg.hunlicenseC++1vector/matrix/quaternion mathPoissonGenerator.hMITC++1Poisson disk points generator (disk or rect)prns.hpublic domainC/C++1seekable pseudo-random number sequencesaomebaMITC/C++1constraint solver (Cassowary) w/Lua binding

multithreading

librarylicenseAPIfilesdescriptionmm_sched.hzlibC/C++1cross-platform multithreaded task scheduler based on enkiTS

network

librarylicenseAPIfilesdescriptionzed_netpublic domainC/C++1cross-platform socket wrappersts_netpublic domainC/C++1cross-platform socket wrapper (socket sets and packet API)mm_web.hBSDC/C++1lightweight webserver, fork of webbypar_easycurl.hMITC/C++1curl wrapperyoctopublic domainC/C++2non-production-use http serverhappyhttpzlibC++2http client requestsmongooseGPLv2C/C++2http serverLUrlParserMITC++2lightweight URL & URI parser RFC 1738, RFC 3986znetMITC/C++1cross-platform networking w/ lua binding

parsing

librarylicenseAPIfilesdescriptionSLREGPLv2C/C++1regular expression matcherPicoJSONBSDC++1JSON parse/serializermm_lexer.hzlibC/C++1C-esque language lexerjson.hpublic domainC/C++2JSON parserjzon.hMITC++2JSON parserparsonMITC/C++2JSON parser and serializerminilibspublic domainC2two-file regex (also binary tree, etc)

profiling

librarylicenseAPIfilesdescriptionRemoteryApache 2.0C/C++2CPU/GPU profiler Win/Mac/Linux, using web browser for viewerMicroProfileunlicenseC++2-4CPU (and GPU?) profiler, 1-3 header files, uses miniz internally

scripting

librarylicenseAPIfilesdescriptionLILzlibC/C++2interpreter for a Tcl-like scripting languagelualiteMITC++1generate lua bindings in C++PicolBSDC/C++1interpreter for a Tcl-like scripting language

strings

librarylicenseAPIfilesdescriptionDG_misc.hpublic domainC/C++1Daniel Gibson's stb.h-esque cross-platform helpers: path/file, stringsutf8public domainC/C++1utf8 string librarystrpool.hpublic domainC/C++1string interningdfaMITC/C++2fast utf8 decoder (need a header file)gb_string.hpublic domainC/C++1dynamic strings

tests

librarylicenseAPIfilesdescriptionutestMITC/C++1unit testingcatchBoostC++1unit testingdoctestMITC++1unit testingSPUTBSDC/C++1unit testingpempek_assert.cppWTFPLv2C++2flexible assertionsminctestzlibC1unit testinggreatestiSCC1unit testingµnitMITC1unit testinglabratpublic domainC/C++1unit testing

user interface

librarylicenseAPIfilesdescriptiondear imguiMITC++9an immediate-mode GUI formerly named "ImGui"; 3rd-party C wrappernuklearpublic domainC/C++1minimal GUI toolkitnoc_file_dialog.hMITC/C++1file open/save dialogs (Linux/OSX/Windows)tinyfiledialogsZLIBC/C++2modal dialogs inc. file open/save (Linux/OSX/Windows)

video

librarylicenseAPIfilesdescriptionjo_mpegpublic domainC++1mpeg file writer

miscellaneous

librarylicenseAPIfilesdescriptionMakeID.hpublic domainC++1allocate/deallocate small integer IDs efficientlylogurupublic domainC++1flexible loggingtinyformatBoostC++1typesafe printfdebug-assertzlibC++1modular assertion macrodbgtoolszlibC/C++2cross-platform debug util librariesstmrMITC2extract English word stemslevenshteinMITC2compute edit distance between two strings

There are also these XML libraries, but if you're using XML, shame on you:

• parsing: tinyxml2: XML
  
• parsing: pugixml: XML (MIT license)

New libraries and corrections

Submissions of new libraries: I accept submissions (as issues or as pull requests). Please note that every file that must be included in a user's project counts; a header and a source file is 2 files, but a header file, source file, and LICENSE (if the license isn't in the source file) is 3 files, and won't be accepted, because it's not 2 files. But actually 'LICENSE' is a problem for just dropping the library in a source tree anyway, since it's not scoped to just the library, so library authors are encouraged to include the license in the source file and not require a separate LICENSE.

Corrections: if information for a library above is wrong, please send a correction as an issue, pull request, or email. Note that if the list indicates a library works from both C/C++, but it doesn't, this could be an error in the list or it could be a bug in the library. If you find a library doesn't work in 32-bit or 64-bit, the library should be removed from this list, unless it's a bug in the library.