A small index of things from the rest of the internet that have survived several clear-outs.

• A list of dice problems — of interest to the aspiring probabilist.
• Detexify — draw a symbol, learn its name. Artificial intelligence applied to the one problem that deserved it.
• Convert — converts file A into file B.
• quiver — a commutative diagram editor, with one-click export to LaTeX.
• Firefox — still.