Math & Physics
| Neutrino Unbound | Nudat 3 | SAGA database |
| JINAbase | Cococubed | Tensor network |
| Observing capability in LIGO | NORAD Atomic Data | NIST Atomic Spetra Database |
| Falstad math & physics demostrations |
Stargazing & Aurora borealis
| astrobin |
| Sunrise & sunset | Moon phase | CDS data |
| ESO raw data | NOAA enthusiasts | See the Aurora |
| GFZ | Polarlicht | Space weather archive |
| meteoblue | ECMWF chart | sat24 |
| zoom earth | NOAA sky cover | Clear outside |
| Chinese calendar | Japanese calendar |
Coding
| Brython |
Miscellaneous
| Jazz Darmstadt | Achteckhaus |
