[bitslayer]

So many dead links! Sad, I would love to poke around a resource like this.

[scruss]

You might have luck on the wayback machine. But some of the links are really, really old: [Inscribing a regular pentagon in a circle – and proving it](https://web.archive.org/web/20001205213400/http://www.cut-th...) fell off the web after 2000!

[ansible]

And some others that are effectively dead, such as the page with the Java applet for Euclid's geometry.