Atom editor

https://atom.io/
Text/Code editor by GitHub.

• Open source.
• Hackable.
• Built with web technology (see Electron).
• Active community.
• JSON format configuration files. 
• Serious Sublime Text alternative.

Remarkable packages (plugins):

• autocomplete+: view and insert possible completions in the editor while typing. Bundled  with Atom.
• atom-ternjs: JS code intelligence for atom with Tern. Adds support for ES5, ES6 (JavaScript 2015), Node.js, jQuery, Angular and more. Extendable via plugins
• jshint: JS validation in real-time or on save.
• angularjs: adds syntax highlighting and snippets to AngularJS.
• atom-typescript: autocomplete, live error analysis, type info, compile on save, tscofig, package and build support, format, ...
• atom-terminal: open terminal panels inside Atom.
• remote-edit: browse and edit remote files using FTP and SFTP.
• minimap: preview of full source code (like the Sublime one).
• color-picker
• pigments: display colors in project and files.
• gulp-control
• atom-live-server