Replit, Pastebin.com, CodeSandbox, CodePen, jsFiddle, StackBlitz, flems.io, PLAYCODE, snippet.host, Ideone, kodeWeave, vscode.dev, JDoodle.com, Bootsnipp, JS Bin, Spck Editor, HTML Code Play, CSSDesk, Browxy, Liveweave, Codeply, Cr8Code, Dabblet, Feditor, Rendera, kodtest, CompileOne, Fiddle Salad, ESNext Bin, JS.do are some alternatives to JSitor.