Julia Evans' blog is one of my favorites! It was a big inspiration for starting my own blog (https://andythemoron.com). I also love High Scalability and Dan Luu's blog which have been mentioned in other comments.

I "follow" several which are mostly defunct, but in terms of blogs that still feature active updates:

Evan Klitze's blog: lots of topics around Linux, C++, etc. https://eklitzke.org/

Sutter's Mill: lots of "state of the world" for C++, but also context, history, etc. https://herbsutter.com/

IT Hare: C++, game programming http://ithare.com/

The Erlangelist: Erlang/Elixir http://theerlangelist.com/

null program: lots of miscellaneous topics http://nullprogram.com/

Fluent C++: the name speaks for itself http://www.fluentcpp.com/

Another Programmer's Blog: Linux, C, C++, C#, MSSQL https://www.stev.org/