PhysicsFS icculus.org

A library to provide abstract access to various archives. It is intended for use in video games, and the design was somewhat inspired by Quake 3's file subsystem. [zlib]

Sutter’s Mill herbsutter.com

C++ tutorial hackr.io

A user ranked online tutorial bank site displaying multiple courses to learn C++ from.

Cheat Sheets of HackingCPP hackingcpp.com

Cool cheat sheets and infographics for algorithms, views, containers, randomness, etc.

gtkmm gtkmm.org

The official C++ interface for the popular GUI library GTK+. [LGPL]

Guru of the Week gotw.ca

A regular series of C++ programming problems created and written by Herb Sutter.

Snappy google.github.io

A fast compressor/decompressor. [BSD]

Libmicrohttpd gnu.org

GNU libmicrohttpd is a small C library that is supposed to make it easy to run an HTTP server as part of another application. [LGPL v2.1+]

libiconv gnu.org

An encoding conversion library between different character encodings. [GPL]

Libgcrypt gnu.org

A general purpose cryptographic library originally based on code from GnuPG. [LGPLv2.1+]

The GNU C Library gnu.org

The purpose of this manual is to tell you how to use the facilities of the GNU C Library.

gettext gnu.org

GNU 'gettext'. [GPL2]

GNU Coding Standard gnu.org

GMP gmplib.org

A C library for arbitrary precision arithmetic, operating on signed integers, rational numbers, and floating-point numbers. [LGPL3 & GPL2]

tup gittup.org

File-based build system that monitors in the background for changed files.

Fontconfig gitlab.freedesktop.org

Font configuration and customization library. [MIT] website

RobWork gitlab.com

A collection of C++ libraries for simulation and control of robot systems. [Apache2] website

waf gitlab.com

Python-based framework for configuring, compiling and installing applications. [BSD] website

juCi++ gitlab.com

Cross-platform, lightweight C++ IDE with libclang integration. [MIT]

Armadillo gitlab.com

Fast C++ library for linear algebra & scientific computing. [Apache2] website

tesseract-ocr github.com

An OCR engine. [Apache2]

KCP github.com

A fast and reliable ARQ protocol that helps applications to reduce network latency. [MIT]

POCO github.com

zap: - C++ class libraries and frameworks for building network- and internet-based applications that run on desktop, server, mobile and embedded systems. [Boost] website

OpenCV github.com

zap: - Open source computer vision. [Apache2] website

Open WatCom github.com

Watcom C, C++, and Fortran cross compilers and tools. [Sybase Open Watcom Public License]

Ogre 3D github.com

zap: - A scene-oriented, real-time, flexible 3D rendering engine (as opposed to a game engine) written in C++. [MIT] website

stb-image github.com

STB single-header image loading library. [Public Domain]

Google Mock github.com

A library for writing and using C++ mock classes. [BSD]

List of C or C++ YouTube Videos github.com

List of Free C or C++ Books github.com

Free C Books github.com

vhf/free-programming-books/C.

utl::random github.com

A C++17 header-only library implementing fast random for Monte-Carlo simulations & gamedev. [MIT]

utl::profiler github.com

Singe-header profiler for C++17. [MIT]

C++ for yourself github.com

A comprehensive tutorial on modern C++ covering everything from fundamentals to software design.

ISO C++ Standards Committee github.com

ISO/IEC JTC1/SC22/WG21 - The C++ Standards Committee. website

Spawned Shelter spawnedshelter.com

Planet Erlang planeterlang.com

Learn You Some Erlang learnyousomeerlang.com

GRiSP grisp.org

Erlang Bookmarks github.com

The Joy of Erlang; Or, How To Ride A Toruk evanmiller.org

Erlang Central erlangcentral.org

GMTL ggt.sourceforge.net

Graphics Math Template Library is a collection of tools implementing Graphics primitives in generalized ways. [GPL2]

gflags gflags.github.io

Commandline flags module for C++. [BSD]

Geometric Tools geometrictools.com

C++ library for computing in the fields of mathematics, graphics, image analysis and physics. [Boost] website

GDCM gdcm.sourceforge.net

Grassroots DICOM library.

Compiler Explorer gcc.godbolt.org

An interactive compiler with assembly output available.

FreeXL gaia-gis.it

an open source library to extract valid data from within Spreadsheets. [MPL/GPL-2/LGPL-2]

FreeType freetype.org

FreeType is a freely available software library to render fonts. [FTL & GPLv2]

FreeImage freeimage.sourceforge.net

An open source library that supports popular graphics image formats and others as needed by today's multimedia applications. [GPL2 or GPL3]