Sites like pqxx.org

Thor Vector Graphics (ThorVG), an open-source lightweight vector graphics engine and project site with release notes by Hermet Park

node-postgres is a collection of Node.js modules for connecting to and querying PostgreSQL databases, with API documentation and guides

Manjaro, a Linux distribution built on Arch with rolling releases, with news and team pages by its core developers

A cross-platform C library and command-line tools for communicating with iOS devices, developed as free open-source software

A translation application for Linux desktop and mobile, built for the GNOME desktop and compatible with the free desktop ecosystem

Pittsburgh Supercomputing Center, a research computing center offering high-performance computing resources and news about scientific discovery since 1986

Box2D is a 2D physics engine for games, with a blog by its creator Erin Catto on game physics and programming

Dyne.org, a digital community and free software foundry blog covering open-source tools, art, ecology and decentralized networks, by Dyne.org

The HDF Group, a non-profit company maintaining the HDF5 data format and library for scientific and engineering data management

Software and writing by Michael R Sweet, covering system monitoring tools, Mini-XML, and related programming projects

Tales of Maj'Eyal, a topdown tactical roguelike RPG game, and the T-Engine4 Lua game engine behind it

A weekly tech newsletter called Weekend Reading by Assaf Arkin, covering tools, UX, management, infosec and random finds

An encyclopedia of PostgreSQL database topics, functions and settings, a work in progress by its author

Xmake, an open-source cross-platform C/C++ build tool and package manager configured in Lua

Michael Tsai's blog on Mac and iPhone software development, Apple news, and tech commentary, running since 2004

Ogre3D, an open source C++ 3D graphics rendering engine with news, community forums, a legacy wiki and support

Eve, an open source Python REST API framework for building and deploying web APIs, documented by its developers

OpenCV, the open-source computer vision library, with its services, training, partner program and blog, run by the OpenCV organisation

libjpeg-turbo is an open source JPEG image codec project using SIMD instructions to speed up JPEG compression and decompression

Xah Code, a personal website of programming tutorials, math notes, blogs and essays by Xah Lee

Personal site of Python developer Marcelo Trylesinski covering FastAPI, Starlette and Uvicorn maintenance, talks, videos and CVE coordination

The Open Source Geospatial Foundation website, a nonprofit hub supporting geospatial open source software projects, their community, events and governance

COIN-OR news blog on open-source operations research software, announcing the COIN-OR Cup awards and foundation board notices

DB Browser for SQLite, an open source visual tool for creating, searching and editing SQLite and SQLCipher database files

VirtualGL, an open-source project providing GPU-accelerated 3D rendering to remote X11 clients, with news, documentation and package repositories

LIEF, a cross-platform C++, Python and Rust library for parsing, inspecting and modifying executable formats like ELF, PE and Mach-O

Throw The Switch, a community site on C development tools such as the Unity, CMock and Ceedling unit-testing frameworks

Rob Landley's personal site hosting his software projects such as toybox and Aboriginal Linux, plus his blog and essays

The International Obfuscated C Code Contest site: rules, entries, winners and FAQ for a yearly C programming contest, by Landon Curtis Noll and Simon Cookson

Joey Hess's personal blog on Debian, software development, off-grid living and related technical projects

Vifm, an open-source terminal file manager with a Vim-like curses interface, documented and maintained by developer xaizek

A collection of free image processing algorithms and documentation for the scikit-image toolbox in Python

Osmocom, an umbrella project developing open source software and tools for mobile communications networks, run on a Redmine project site

Drizzle Team's open-source TypeScript libraries: Drizzle ORM, Drizzle Kit, Drizzle Seed, Drizzle GraphQL, and CLI tools

VisiData is an open-source terminal tool for viewing, editing and analysing tabular data, with its documentation and quick reference guide

JHipster, an open source platform for generating full stack Java applications with Spring Boot and Angular or React