An eclentric set of online things. Links to those things:
🔃 Memoire spaced repetition system
∑ RTensor formula calculator
🐚 Unix shell and Lua scripts
⚒ Miscellaneous web apps
∿ Desmos graphs
📓 Arbitrary Notes
dkl9 is still around, but will update the site less often until 2023-360. Assume they're gone only if this notice is not renewed or removed by then.