Harp is described as 'The static web server with built-in preprocessing' and is an app in the Development category. There are more than 50 alternatives to Harp for a variety of platforms, including Mac, Windows, Linux, Online / Web-based and Self-Hosted solutions. The best alternative is jQuery, which is both free and Open Source. Other great apps like Harp are AngularJS (Free, Open Source), GitHub Pages (Freemium), Neocities (Freemium, Open Source) and ExpressJS (Free, Open Source).
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Lumen is the stunningly fast micro-framework by Laravel. Use the Laravel features you love like Eloquent, caching, queues, validation, routing, middleware, and the powerful Laravel service container. All with almost zero configuration.