| abseil-cpp | Abseil Common Libraries (C++), LTS Branch | 
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| ada | WHATWG-compliant and fast URL parser written in modern C++ | 
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| aixlog | Header-only C++ logging library | 
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| amqp-cpp | AMQP-CPP is a C++ library for communicating with a RabbitMQ message broker | 
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| antlr-cpp | The ANTLR 4 C++ Runtime | 
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| argparse | Argument Parser for Modern C++ | 
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| asio | Asynchronous Network Library | 
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| atkmm | C++ interface for the ATK library | 
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| azure-core | Azure SDK for C++ | 
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| azure-identity | Azure SDK for C++ | 
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| azure-security-keyvault-certificates | Azure SDK for C++ | 
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| azure-security-keyvault-keys | Azure SDK for C++ | 
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| benchmark | A microbenchmark support library | 
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| cairomm | C++ bindings for the Cairo vector graphics library | 
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| catch | Modern C++ header-only framework for unit-tests | 
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| cctz | C++ library for dealing with time zones and time conversion | 
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| cld3 | Neural network model for language identification | 
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| clhpp | Khronos OpenCL C++ bindings | 
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| cli11 | Command line parser for C++11 | 
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| clucene | High-performance, full-featured text search engine based off of lucene in C++ | 
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| cppdap | C++ library for the Debug Adapter Protocol | 
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| cppgir | GObject-Introspection C++ binding wrapper generator | 
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| cpp-httplib | C++ HTTP/HTTPS server and client library | 
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| cpptoml | Header-only library for parsing TOML | 
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| ctemplate | A simple but powerful template language for C++ | 
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| curlpp | C++ wrapper for libcURL | 
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| doctest | The fastest feature-rich C++11/14/17/20 single-header testing framework | 
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| edencommon | Shared library for Watchman and Eden projects | 
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| eigen | C++ template library for linear algebra | 
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| elfio | ELF reader/producer header-only C++ library | 
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| ETL | Multi-platform class and template library | 
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| expected | Single header implementation of std::expected with functional-style extensions | 
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| expected-lite | Expected objects in C++11 and later in a single-file header-only library | 
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| exprtk | C++ Mathematical Expression Parsing And Evaluation Library | 
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| fast_float | Fast and exact implementation of the C++ from_chars functions for number types | 
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| fb303 | Core set of Thrift functions querying stats and other information from a service | 
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| fbthrift | Facebook's branch of Apache Thrift (C++ bindings) | 
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| fizz | C++14 implementation of the TLS-1.3 standard | 
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| folly | An open-source C++ library developed and used at Facebook | 
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| frugally-deep | Header-only library for using Keras models in C++ | 
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| functional-plus | Functional Programming Library for C++ | 
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| gflags | Google's C++ argument parsing library | 
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| glaze | Extremely fast, in memory, JSON and interface library for modern C++ | 
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| glibmm | C++ interface for glib2 | 
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| glog | Google Logging library | 
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| gpgmepp | GnuPG Made Easy is a library for making GnuPG easier to use (C++ bindings) | 
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| gstreamermm | C++ interface for GStreamer | 
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| gtest | Google C++ Testing Framework | 
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| gtkmm | C++ interface for GTK+ | 
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| gtksourceviewmm | C++ bindings for gtksourceview | 
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| gulrak-filesystem | Header-only single-file std::filesystem compatible helper library | 
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| highway | Performance-portable, length-agnostic SIMD with runtime dispatch | 
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| htmlcxx | A simple non-validating CSS 1 and HTML parser for C++ | 
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| json11 | A tiny JSON library for C++11 | 
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| jsoncons | C++ header-only library for JSON and JSON-like data formats | 
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| jwt-cpp | header only library for creating and validating JSON Web Tokens in C++11 | 
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| kokkos | C++ Performance Portability Programming EcoSystem | 
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| libcmis | C++ client library for the CMIS interface | 
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| libjson-rpc-cpp | JSON-RPC (1.0 & 2.0) framework for C++ | 
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| libmcpp | A portable C++ preprocessor | 
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| libxmlpp | C++ wrapper for the libxml2 XML parser library | 
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| lucene++ | C++ port of Lucene library, a high-performance, full-featured text search engine | 
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| magic_enum | Static reflection for enums in header-only C++ | 
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| mm-common | Build infrastructure and utilities for GNOME C++ bindings | 
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| msgpack-cxx | MessagePack for C++ | 
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| ms-gsl | Guideline Support Library implementation by Microsoft | 
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| muParser | Library for parsing mathematical expressions | 
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| muParserX | Parsing Expressions with Strings, Complex Numbers, Vectors, Matrices and more | 
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| mvfst | An implementation of the QUIC transport protocol | 
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| nlohmann_json | JSON for Modern C++ | 
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| notcurses | Blingful TUIs and character graphics | 
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| opentelemetry-cpp | The OpenTelemetry C++ Client | 
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| pangomm | C++ interface for pango | 
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| pcg-cpp | Family of better random number generators | 
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| picojson | Header-file-only, JSON parser serializer in C++ | 
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| popl | Header-only C++ program options parser library | 
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| prometheus-cpp | Prometheus Client Library for Modern C++ | 
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| pystring | C++ functions matching the interface and behavior of python string methods | 
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| random123 | library of counter-based random number generators (CBRNGs) | 
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| range-v3 | Range library for C++14/17/20, basis for C++20's std::ranges | 
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| rapidfuzz-cpp | Rapid fuzzy string matching in C++ | 
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| rapidyaml | Library to parse and emit YAML, and do it fast | 
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| robin-map | C++ fast hash map and hash set using robin hood hashing | 
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| scitokens-cpp | C++ implementation of the SciTokens library with a C library interface | 
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| sdbus-c++ | High-level C++ D-Bus library | 
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| simdutf | Unicode validation and transcoding at billions of characters per second | 
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| simpleini | C++ library providing a simple API to read and write INI-style files | 
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| sol2 | Header-only C++ <-> Lua API wrapper | 
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| sparsehash | An extremely memory-efficient hash_map implementation | 
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| string-theory | A flexible modern C++ library for string manipulation and storage | 
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| taskflow | Modern C++ Parallel Task Programming | 
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| tbb | High level abstract threading library | 
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| tclap | Simple templatized C++ library for parsing command line arguments | 
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| termcolor | A header-only C++ library for printing colored messages to the terminal | 
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| toml11 | TOML for Modern C++ | 
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| tomlplusplus | TOML config file parser and serializer | 
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| tree | An STL-like tree class | 
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| ut2-glaze | Stripped down fork of boost-ext ut2 | 
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| valijson | Header-only C++ library for JSON Schema validation | 
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| wangle | A framework providing common abstractions for building services | 
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| waylandpp | Wayland C++ bindings | 
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| websocketpp | C++/Boost Asio based websocket client/server library | 
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| xsimd | C++ wrappers for SIMD intrinsics | 
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| yaml-cpp | YAML parser and emitter in C++ | 
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