Mozilla's CA certificate bundle for TLS/SSL validation in command-line tools and libraries.

OpenSSL 3.x: cryptographic library and command-line toolkit for SSL/TLS, hashing, and encryption.

Fast, modern compression algorithm and command-line tool with better compression ratios and speed than gzip or bzip2.

C library for configuring and matching fonts on Unix/Linux systems.

GNU C library for command-line editing and history in interactive shells.

C library providing core data structures, event loops, and utilities for GNOME and GTK applications.

Perl Compatible Regular Expressions (PCRE2) C library for pattern matching with modern API and advanced features.

C/C++ library providing Unicode support, text processing, and internationalization (i18n) utilities.

LZ4 is a C compression library and command-line tool optimized for speed over ratio, trading compression density for extremely fast encode/decode.

C/C++ OpenType text shaping engine for rendering complex scripts and variable fonts.

C library for arbitrary-precision decimal floating-point arithmetic.

C library implementing the IETF QUIC protocol for encrypted, multiplexed transport.

C library for reading, writing, and manipulating PNG image files.

GNU C library for arbitrary-precision arithmetic on integers, rationals, and floating-point numbers.

C library for Unicode string manipulation, normalization, and text processing.

C library for ICC color profile handling and color space transformations.

GNU library and command-line toolkit for internationalization (i18n) and localization (l10n) of software.

C shared library for building text-based UI applications with terminal control and cursor positioning.

C library implementing HTTP/3 and QUIC protocol stack for building HTTP/3 clients and servers.

Core X11 protocol client library for X.Org, the foundational display server for Unix/Linux GUIs.

High-performance JPEG codec library (C) with 2-4× faster compression/decompression than libjpeg.

C library and utilities for reading and writing TIFF image files with compression support.

C++ shared library for advanced font shaping and rendering of complex scripts.

C library and CLI tool for querying compiler and linker flags from pkg-config metadata files.

C library for rendering TrueType, OpenType, and bitmap fonts.

C library for parsing XML 1.0 documents.

C library implementing TLS, DTLS, and X.509 certificate handling per GNU standards.

Modular compiler infrastructure library and toolchain for building languages, optimizers, and code generators.

High-performance zlib-compatible C compression library optimized for modern CPUs.

Fast HTTP parser library written in TypeScript and compiled to C, a modernized port of http_parser.

C library that provides a portable interface for calling functions with arguments determined at runtime.

C library implementing HTTP/2 protocol with client and server support.

Shared library providing common X11 protocol extensions (Shape, Sync, XTest, etc.).

Shared library implementing POSIX 1003.1e capabilities for fine-grained privilege control on Linux.

Generic-purpose lossless compression algorithm with LZ77, Huffman coding, and context modeling; similar speed to deflate with denser compression.

X11 protocol header files and specifications for Xorg development.

C library and command-line utilities for reading, writing, and manipulating GIF images.

Header-only C++ library providing type-safe string formatting, printf-style and range-based output.

C++ library for parsing and rendering PDF documents with support for text extraction and annotation handling.

Compiler and runtime library for Protocol Buffers, Google's language-neutral serialization format.

C library for perceptual video quality assessment using Netflix's Emmy-winning VMAF algorithm.

Python library providing Mozilla's curated SSL certificate bundle for TLS host verification.

C library for 2D vector graphics rendering with support for multiple output backends (PDF, PostScript, PNG, X11).

Command-line and library tools for creating, editing, and converting images across 200+ formats.

LLVM's OpenMP runtime library for parallel computing in C, C++, and Fortran.

C library providing low-level access to the X Window System protocol via XCB.

C library for asynchronous DNS resolution without blocking.

C library for encoding and decoding AV1 video streams.

Low-level C library for pixel manipulation and image compositing.

C++ library and tools for high dynamic-range (HDR) image files with lossless compression.

C++ library providing SIMD-accelerated JSON parsing with high throughput.

H.265/HEVC video encoder library and command-line tool written in C++.

Low-level C cryptographic library providing hash, cipher, and public-key algorithms.

C++ library for fast Unicode validation and conversion using SIMD instructions.

Fast, portable AV1 video decoder library written in C, optimized for speed and small footprint.

C library for asynchronous I/O and event-driven programming across Unix and Windows.

X11 shared library implementing the X Authorization Protocol (XAu) for display access control.

Open-source JPEG2000 Part 15 (HTJ2K) codec library and command-line tool for lossless and lossy image compression.

WHATWG-compliant URL parser library written in modern C++ with high performance across platforms.

Shared library implementing the X Display Manager Control Protocol for X11 display management.