Sites like restsharp.dev

Meziantou's blog by Gérald Barré on .NET, C# and web development, covering cancellation, async programming and developer tooling

xUnit.net is an open source unit testing tool for C#, F# and Visual Basic, led by project lead Brad Wilson

Mainsail, a web interface documentation site for controlling and monitoring 3D printers running the Klipper firmware

A blog by Nima, a principal cloud engineer, on C#, .NET performance, and low-latency distributed messaging components

NuGet is the central package repository and package manager for .NET, with package search, download statistics and client tools

Michael Wallner's blog about PHP extensions, Linux server setup, and computer hardware troubleshooting, titled Mike's sudden Inspirations

Klipper documentation: an English-language reference site for Klipper, firmware that runs 3D printers, with configuration and developer guides

OctoPrint, an open source web interface for controlling and monitoring 3D printers, with a blog, help pages and merchandise by Gina Häußge

A software development podcast covering coding agents, event-driven architecture, functional programming, and other engineering topics, with episodes listed by tag

CodeOpinion, a blog and video channel on software architecture and design topics by Derek Comartin

A personal blog and consultancy site by Dustin, a polyglot programmer writing on Go, .NET, DevOps and software security

Appium documentation: an open-source software project for UI automation of mobile, browser and desktop apps

Mockoon, a free open-source desktop app and CLI for designing and running mock APIs locally, plus the Mockoon Pro team service

Mocha, a JavaScript test framework for Node.js and browsers, with its project documentation and API reference

Code with Steve, a blog on .NET and C# programming by Steve Gordon, a senior engineer at Elastic

GrapesJS, an open-source JavaScript framework and documentation site for embedding a drag-and-drop web page builder

Milan Jovanović's website selling .NET and software architecture courses, bundles, and blog-style engineering articles

SelectorsHub, a set of free browser tools and blog for software testers, led by founder Sanjay Kumar

Six Labors is a company's website selling a .NET graphics library suite (ImageSharp, Drawing, Fonts) and its commercial licensing

Coding Stephan, a personal blog by Stephan van Rooij on API security, Microsoft Graph, PowerShell and smart home projects

James Montemagno's personal blog on coding, developer tools, cycling and life, with posts on new utilities like PDF Diff

Bugzilla project's website on the open-source bug-tracking software for planning and releasing software, with documentation, history and donation pages

WebdriverIO API reference documentation for the WebdriverIO browser and mobile test automation framework's commands and protocol bindings

A documentation site for FastEndpoints, an open-source .NET framework for building ASP.NET web API endpoints

Selenium, an open-source browser automation tool for web application testing, documented on its official project website

Reqnroll, an open-source Cucumber-style BDD test automation framework for .NET, with news and release announcements

Packagist, the main public repository of PHP packages installable with the Composer dependency manager, with package search, API and feeds

Dev notes by Darío Kondratiuk, a Buenos Aires software developer, on browser automation, .NET and Puppeteer-Sharp

Personal blog by Mads Kristensen on Visual Studio extensions, ASP.NET Core, web development and home automation

Nokogiri, a Ruby library documentation site for parsing and manipulating XML and HTML, with licence, roadmap and security pages

Faker, a JavaScript library documentation site for generating realistic fake test data, with API reference, guide and modules

The official website for the Go open-source programming language, with documentation, tutorials, and the Go Blog

ESLint project website: documentation, playground and team pages for ESLint, the pluggable open-source JavaScript linter

The aiohttp.org site is the documentation and project page for aiohttp, an asynchronous Python HTTP client and server library built on asyncio

Event-Driven, a blog, talks and guides by Oskar Dudycz on software architecture, Event Sourcing, CQRS and event-driven design

Shields.io is a service that generates concise, consistent badges for GitHub readmes and other web pages

JUnit, a open-source testing framework for Java and the JVM, with documentation, release notes and project information

A catalog of open source JSON, YAML and TOML schemas used by editors and tools for validation and completion

Flipper Cloud, a hosted feature-flag service for Ruby applications, with a self-hosted Pro option, from the team behind open-source Flipper

A JavaScript toolkit, gulp.js, for automating build workflows with composable streaming tasks and plugins, documented through its project website