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vanilla-lazyload
LazyLoad is a lightweight, flexible script that speeds up your website by deferring the loading of your below-the-fold images, backgrounds, videos, iframes and scripts to when they will enter the viewport. Written in plain "vanilla" JavaScript, it leverages IntersectionObserver, supports responsive images and enables native lazy loading.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
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If you want to guarantee lazy-load across all (JavaScript-capable) browsers and not just images, I've used Vanilla Lazyload a couple years ago with success, but as this relies on using a data-src attribute, you will get W3C validation errors unless you also set a src attribute. But you don't want to set the src to a real image, because this will nullify the whole point of using the plugin, so set it to a 1x1 pixel "image" that will immediately get replaced by the data-src once the image scrolls into view.
I use Squoosh to convert individual images to WEBP. I haven't found a good free bulk tool yet, and I still find I have to mess with the settings to make sure the image still looks good after being compressed.
Image Optim: Mac only, can set custom compression settings and remove heavy metadata. I use this after resizing the images in Bulk Resize since the compression settings here are much more comprehensive.