Biot-Savart magnetic Toolbox (Github, Mathworks)
The BSmag Toolbox is a Matlab toolbox for the numerical integration of the Biot-Savart law. It provides a simple solution to calculate the magnetic flux density generated by an arbitrary current carrying filament in the magnetostatic approximation.
If you use this code, send me message with the reference and I will add it to the users list. If you would like to acknowledge it (and direct others to it), you could use a reference like this:
[1] L. Quéval, “BSmag toolbox user manual,” Tech. report, Dept. Elect. Eng., University of Applied Sciences Düsseldorf, Germany, April 2015. Available: [Accessed April. 07, 2015].

BSmag example

Load flow analysis
DM ISE2018: