[1] Tanya Khovanova, Soviet-American mathematician who became the second female gold medalist at the International Mathematical Olympiads.

https://www.tanyakhovanova.com/

[2] Filippo Valsorda (cryptography)

https://filippo.io/

[3] David Wong (cryptography)

https://www.cryptologie.net/

[4] OpenBSD everything

https://www.undeadly.org/

[5] blog with some funny articles

https://idlewords.com/

[6] Might need a proxy/VPN to access this site

https://www.otherhand.org/

[7] Not a blog but something nice

https://thenicestplace.net/

Edit:

[8] weekly useful/curious datasets

https://www.data-is-plural.com/archive/

[9] documenting startups getting swallowed by the big fish

https://ourincrediblejourney.tumblr.com/