The Internet is genuinely one of the best things to come out of 20th century. It has so many implications for the future and can solve so many of the world's problems, it is exciting.
Amazing thing about the web is the fact that clients (browsers) and servers can interact in complex ways without the client knowing anything beforehand about the server and the resources it hosts.
RealWorld - Exemplary fullstack Medium.com clone powered by React, Angular, Node, Django, and many more.
Internetting is hard - Friendly web development tutorials for complete beginners.
devd - Local webserver for developers.
Lwan Web Server - Experimental, scalable, high performance HTTP server.
NetData - System for distributed real-time performance and health monitoring.
Squoosh - Make images smaller using best-in-class codecs, right in the browser.
instant.page - Uses just-in-time preloading — it preloads a page right before a user clicks on it.
UI Elements - Collection of UI element samples written with vanilla web platform features.
gotify/server - Simple server for sending and receiving messages in real-time per web socket.
Sizzy - Tool for testing responsive websites crazy-fast.
Awesome Stacks - Curated list of tech stacks for building different applications & features.
Build Tracker - Set of tools to track the size of your build artifacts over time.
static.fun - Fun demo for wildcard domains.
W3C on GitHub - Resources useful when working on W3C projects using GitHub.
urlwatch - Monitors webpages for you.