Multilayer Coil Inductance Value Design Calculator - Jotrin Electronics
Air core inductor equations
Coil32 - Resource Detail - The DXZone.com
Multi layer air coil design and calculator
Spiral Coil Calculator
Inductance of Air Core Inductor Calculator
GitHub - radioacoustick/Coil64: Coil64 is inductance coil calculator, that allows to calculate the single-layer and multi-layer air core inductors, the ferrite core inductors or chokes, planar coils on PCB etc.
How to calculate coil inductance (single-layer, cylindrical air core inductors) - Online Javascript
The Communicator Digital Edition: Make Your Own Single-layer Air-core Coil