The best alternatives to Macaw are Tone Analyzer by IBM, myCompiler, and Comet. If these 3 options don't work for you, we've listed a few more alternatives below.
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myCompiler is a simple and easy to use IDE where you can edit, compile and run your code in the programming language of your choice. It currently supports 16 programming languages with features like auto-completion, syntax highlighting and code collaboration.
A Linter for All Markup Languages. - Conformance checking - On Your House Rules - For Designed Structures - Set for each the CSS Selector - Supporting Template Engine This is an open-source module for JavaScript. You can use it for free under the MIT license.