It's just a blog by Karl Hoitsma.
The first post was in June 2017.
Topics include:
- (mostly applied) mathematics
- (as no more than a layperson) science
- structural engineering
- computer programming
- Python programming
- Julia programming
- (lots of) software
- (iPhone, Raspberry Pi) hardware
- (some) observations
- (some) thank-yous
Email: khoitsma at mathpax.com
https://www.mathpax.com/feed 
I added a new page called “Gallery”
Here’s the link: