Obsidian is the private and flexible note‑taking app that adapts to the way you think.
Vim - the ubiquitous text editor
CodePen: Online Code Editor and Front End Web Developer Community
Xcode 15 enables you to develop, test, and distribute apps for all Apple platforms.
Dillinger is an online cloud based HTML5 filled Markdown Editor. Sync with Dropbox, Github, Google Drive or OneDrive. Convert HTML to Markdown. 100% Open Source!
WebStormThe JavaScript and TypeScript IDE
Aptana Studio 3 is an open-source web development IDE, and while we are no longer actively maintaining the repository, it is still open-source and public so if you wish to download Aptana Studio 3 you can do so on GitHub.