I can’t think of any super-duper creative free web tools that I currently use (and certainly not one that someone else hasn’t so eloquently written about!), so here is one I’m really sad is no longer available.
A site that I used when I was working towards my masters about 15 years ago was Yahoo’s GeoCities. It was a free webhosting service that was super easy to use. Part of my senior project was putting together a website to help our district teachers better understand the Professional Development Committee and how to earn their PDC points. My website wasn’t huge, but it probably had about 15-20 pages. I worked on it a lot to make sure all of the links worked. I hate broken links!! Yahoo shut the entire GeoCities site down in 2009. Yahoo gave us plenty of time to move our websites. Wikipedia has some information about GeoCities if you want to know anything else: https://en.wikipedia.org/wiki/Yahoo!_GeoCities