Cross-platform toolchain for building and packaging C++ code

https://build2.org

3D collision detection and rigid body dynamics library

http://www.bulletphysics.com/

Broadcom AirForce IEEE 802.11 Firmware Kernel Module

Broadcom AirForce IEEE 802.11 Firmware Kernel Module

Block-sorting file compressor

http://www.bzip.org/

Better and stronger spiritual successor to BZip2

https://github.com/kspalaiologos/bzip3

Asynchronous DNS resolver library

http://c-ares.haxx.se/

Blocking, shuffling and loss-less compression library

https://blosc.org/

High performance compressor optimized for binary data

https://www.blosc.org/ https://github.com/Blosc/c-blosc2

Library for augmenting JDBC drivers with JNDI-bindable DataSources

https://www.mchange.com/projects/c3p0/

Commodore 64 X11 fonts

https://beej.us/c64bdf/

The root certificate bundle from the Mozilla Project

Program to extract Microsoft cabinet (.CAB) files

http://www.cabextract.org.uk/

Fast, cross-platform HTTP/2 web server with automatic HTTPS

https://caddyserver.com

Wayland kiosk

https://www.hjdskes.nl/projects/cage/

Vector graphics library with cross-device output support

https://www.cairographics.org/

C++ interface to cairo

http://cairographics.org

C++ interface to cairo

https://cairographics.org

File manager for the MATE desktop

https://mate-desktop.org/

Lightweight alternative to sudo

https://www.keltia.net/programs/calife

GNUstep application for digital still cameras

http://home.gna.org/gsimageapps/

Framework that allows to access digital cameras

http://home.gna.org/gsimageapps/

CLI to access RTSP/ONVIF devices (e.g. IP cameras)

https://github.com/steipete/camsnap/

Cantarell, a Humanist sans-serif font family

https://wiki.gnome.org/Projects/CantarellFonts

Serialization/RPC system

https://capnproto.org/

Multi-platform, multi-architecture disassembly framework

http://capstone-engine.org/

Audit Cargo.lock for crates with security vulnerabilities

https://rustsec.org/

Cargo C-ABI helpers

https://github.com/lu-zero/cargo-c

Gnome On-Screen keyboard

http://live.gnome.org/Caribou

Managing notes on small cards

Simple tool to analyze noise and distortion of a RF system

https://rfcascade.sourceforge.net/

Monospaced font with programming ligatures

https://github.com/microsoft/cascadia-code

DataStax C/C++ Driver for Apache Cassandra

https://datastax.github.io/cpp-driver/

Highly scalable distributed database

https://cassandra.apache.org/

Highly scalable distributed database

https://cassandra.apache.org/

Header-only test framework for C++

https://github.com/catchorg/Catch2

Test framework for C++ (3.x series)

https://github.com/catchorg/Catch2

MS Word/Excel converter to plain ASCII or TeX. TK viewer included

http://www.wagner.pp.ru/~vitus/software/catdoc/

Coin-or Branch and Cut: mixed integer programming solver

https://projects.coin-or.org/Cbc

Reference implementation of the C interface to the legacy Fortran BLAS

https://www.netlib.org/blas/blast-forum/

Tool to minimize the compile time of C/C++ programs

https://ccache.samba.org/

CDDB client bundle GNUstep

http://gsburn.sourceforge.net/

Compare directories and select files to copy

http://home.hccnet.nl/paul.schuurmans/linux/index.html#xdircmp

CDDA extraction tool (also known as ripper)

http://www.xiph.org/paranoia/

Record CD-R[W]s in disk-at-once mode

http://cdrdao.sourceforge.net/

Command-line CD/DVD writing suite

http://www.cdrkit.org/

Tool to lookup CD-ROM dictionaries

https://www.nerimadors.or.jp/~jiro/cdrom2/

CD/DVD/BluRay and ISO-9660 image creation and extraction tools

http://cdrecord.berlios.de/old/private/cdrecord.html

Cellular phone-number read/write tool (in Japan only)

http://www.nurs.or.jp/~kurati/celrw/

Vector graphics tool for GNUstep

http://www.cenon.info/dLinux_gb.html