ideone.com : Ideone is an online compiler and debugging tool which allows youto compile source code and execute it online in more than 60 programming languages.
repl.it : Powerful and simple online compiler, IDE, interpreter, and REPL. Code, compile, and run code in 30+ programming languages. including JavaScript, Pytho...
GitHub Copilot : With GitHub Copilot, get suggestions for whole lines or entire functions right inside your editor.
metaflop : Metaflop is an easy to use web application for modulating your own fonts. Metaflop uses Metafont, which allows you to easily customize a font within t...