W3Schools is a free web developer education site offering tutorials, references and an online editor for HTML, CSS, JavaScript, SQL, Python and other languages.
Cursor is an AI-first code editor from Anysphere, built on VS Code, that lets developers write, edit and understand code with AI chat, autocomplete and agent features.
Codeium is an AI coding assistant company, behind the Windsurf editor, offering code autocomplete, chat and agentic coding tools across many IDEs and programming languages.
JetBrains is a Czech software company that makes developer tools and IDEs such as IntelliJ IDEA, PyCharm and WebStorm, and created the Kotlin programming language.