Sites like grapesjs.com

Editor.js, a free open-source block-style rich text editor framework with JSON output, documented through its API reference and guides

Directus, an open-source headless CMS and data backend with an API, documented in its docs, video series and blog-style pages

LiquidJS, a JavaScript template engine implementing the Liquid templating language, documented on its project website

Tiptap, a headless open-source rich text editor framework and its commercial cloud platform for building custom editors

React-Uploady is a lightweight React library and documentation site for building browser file-upload features

Motion, an open-source JavaScript and React animation library with docs, showcase examples and a paid Motion+ component kit

An open-source React and Next.js onboarding library for building interactive product tours, with documentation, FAQ and demo

A modular WYSIWYG HTML editor library, MIT licensed, with documentation and a live playground, named SunEditor

Personal site of Trung Vo, a Singapore-based web developer and Google Developer Expert, covering Angular, frontend development, conference talks and career advice

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

A collection of free online tools for text, image and PDF tasks, gathered in one toolbox by 10015 Tools

A personal portfolio site by Praveen Kumar Purushothaman, a developer with work experience at GameAnalytics, Headforwards Solutions and Accenture

Synfig Studio is free, open-source 2D animation software for Windows, Linux and macOS, using vector and bitmap artwork

MapStruct is a Java code generator project for simplifying bean-to-bean mappings, documented on its official project website

Email Markup Consortium, a community group publishing reports, a markup database and client support rankings on email markup standards

Silex, a free open-source visual no-code website builder for static sites, part of the OW2 community

Personal blog by Ionică Bizău, a Romanian programmer, pianist and organist writing on software, Linux, music and faith

NativeScript, an open-source framework for building native iOS and Android apps with TypeScript, plus a showcase of community apps

Dokku, an open source self-hosted PaaS alternative to Heroku built on Docker, with installation guides and tutorials

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

A free open-source CDN serving popular JavaScript, CSS and font libraries, with an API and library catalogue

massCode is a free, open-source, local-first developer workspace app for snippets, notes, API requests, diagrams and calculations

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

A web-based motion graphics editor for creating animated videos in the browser, named Motionity, available on desktop computers only

Leantime, an open source project management software for teams, with a mobile app in beta

ConvertCSV.com is an online tool for converting CSV files into JSON, XML, SQL, Excel and other data formats

Grist Labs' spreadsheet-based software for building secure no-code business apps, AI assistant, forms and case management

lirena00's portfolio and blog by a 21-year-old undergraduate developer, sharing projects, tools, drawings and personal writing

An interactive web guitar tool built with React, letting visitors play chords and strings in the browser

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

Zulip, an open-source team chat application with threaded async messaging, API documentation and help center, by Zulip developers

Mautic is an open source marketing automation software project and product, with its community hub on Slack

electerm is a free open-source multi-protocol remote client for terminal, SSH, SFTP, Telnet, serial, RDP, VNC and FTP

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

Dokploy, a self-hosted platform for deploying containerized applications and databases across multiple servers

Vikunja, an open-source self-hostable task manager with lists, Kanban and Gantt views, with documentation and a Pro tier

A stock library of free and paid SVG backgrounds, icons and website graphics by designer Matt, with copy-paste export

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

Blitz.js, a fullstack toolkit and conventions framework for building Next.js applications, with documentation and showcase pages

Rocket.Chat, an open source team chat and collaboration platform for secure, self-hosted government and enterprise communications

CoderLuii is a site of self-hosted open-source software tools by a cybersecurity engineer, with project pages and GitHub links

A web app that helps artists mix paint colors from photos, analyze tonal values and draw with grids

jsDelivr is a free open source CDN service delivering JavaScript, ESM modules and other files from npm and GitHub