$ ls ~/labs

Labs

Small web apps that run entirely in your browser: a Minecraft seed map and an orrery of the stars around the Milky Way's black hole. Free, no sign-up.

Minecraft

mc-wayfinder

Minecraft seed map companion — biomes, structures, and waypoints. Runs offline in your browser.

Paste a Java seed and get biomes, structures and ores
Nearest-structure finder and your own waypoints
Rust compiled to WebAssembly; nothing is uploaded

mc.hxhippy.com

Astrophysics

S cluster

An orrery of the stars orbiting Sagittarius A*, starring S301, the GRAVITY+ star whose orbit probes the black hole's spin.

Stars on real Keplerian orbits around Sgr A*, with GR precession
S301: an 8.7-year orbit that swings to about 140 Schwarzschild radii
Run the orbital clock in years, or the relaxation clock in megayears

s301.hxhippy.com