CTF List – A really good CTF is a work of art unto itself.
memfetch – Cache wrapper for fetch. While I’m not keen on caching POST requests, I think this is otherwise a neat option.
Node.js Fundamentals: Web Server Without Dependencies – You can do a fair bit without pulling in an entire framework.
Route specific configuration in Slim PHP – Authentication requirements are the main example that comes up for this.
Remove Image Background – It looks at photos of people and removes the background, automatically.
Bent – Another Node.JS HTTP client, from the original author of request.
Page Weight Matters – lesson from YouTube about how your RUM performance metrics might not be telling you what you think they are telling you.
Live PHP REPL – From 3v4l.org, which makes it possible to test PHP snippets with a large number of PHP versions.
HTTP/2 Prioritization – This is an area that is only just started to be explored, and it can have a significant impact on how a page is rendered.
Vitess – MySQL scaling solution, from YouTube.
DNS-over-HTTPS on OS X – Just three instructions, if you have brew handy.
Alpaca Markets – API first market trading.
Laws of UX – A beautiful list of example design principles.
CSS and Network Performance – Treat resources required for rendering a page with care.