The following websites are more or less the same concept: A button takes you to a random site included in some secret master list, which is loaded with cool sites. I think they're a great time waster (as if I had time to wasteğŸ˜)
www.boredbutton.com
theuselessweb.com
cloudhiker.net
sharkle.com
jumpstick.app
weboasis.app (which used to be weboas.is) is a bit different but I'm including it for similar reasons. Its designed as a browser homepage, much like the one you are on now, however I wanted full customization of whatever I want to add, which weboasis does not offer. It might be more your style though, so give it a look. I'm linking it here because there is a TON of useful links and tools on that page, that I want to keep handy.
weboasis.app
More stuff that doesn't fit the original description at the top:
pointlessweb.com - A collection of, as the name suggests, pointless websites.
sitelike.org - Submit a url, get some similar sites.
Awesome Web Desktops - "Websites, web apps, portfolios which look like desktop graphical user interfaces"
curlie.org and dmozlive.com - Both are expansive web directories. dmoz is faster but isn't https so pick your poison.
backlinkwatch.com - Allows you to find what sites link to a url that you provide. Has potential to be a great web tool but I really don't like the design...