HTTP Observatory
Developed by Mozilla, the HTTP Observatory performs an in-depth assessment of a site’s HTTP headers and other key security configurations.
Webflow is a platform for creating custom websites using HTML, CSS, and JavaScript. It offers features for designing, animating, publishing, and collaborating on websites, generating clean, semantic code. Users can customize webpage structures by dragging in unstyled HTML elements and transforming them into reusable components. The platform also offers control over CSS properties and a Class system for site-wide changes. Users can create complex animations and content-rich pages, pulling live content from Webflow’s CMS. The platform supports collaboration with advanced roles and permissions, SEO with fine-tuned controls, and the creation of localized experiences for global visitors.
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PageSpeed Insights
PageSpeed Insights (PSI) reports on the performance of a page on both mobile and desktop devices, and provides suggestions on how that page may be improved.
LlamaCoder
An open source Claude Artifacts app that can generate full React apps and components with Llama 3.1 405B. 100% free and open source.
Thunkable
Thunkable is a powerful drag-and-drop app builder made by two of the first MIT engineers on MIT App Inventor.
Socket.io
Socket.IO aims to make real-time apps possible in every browser and mobile device, blurring the differences between the different transport mechanisms.
IcoMoon
IcoMoon provides a package of vector icons, along with a free HTML5 app for making custom icon fonts or SVG sprites. Browse among thousands of pixel perfect icons or import your own vectors.
GrapesJS
GrapesJS is an open-source, multi-purpose, Web Builder Framework which combines different tools and features with the goal to help you (or users of your application) to build HTML templates without any knowledge of coding.
HttpWatch
HttpWatch is an HTTP viewer and debugger that integrates with IE and Firefox to provide seamless HTTP and HTTPS monitoring without leaving the browser window. It's available as a free edition and a PRO version that cost money and has additional features.