- Ngspice http://ngspice.sourceforge.net
- LTSpice http://www.analog.com/en/design-center/design-tools-and-calculators/ltspice-simulator.html
- Qucs http://qucs.sourceforge.net
- iCircuit http://icircuitapp.com
- Circuit JS http://www.falstad.com/circuit/circuitjs.html
- Port of Circuit JS http://lushprojects.com/circuitjs/
- Every Circuit http://everycircuit.com
- CircuitLab https://www.circuitlab.com/editor/
- openEMS http://openems.de/
- MMANA-GAL http://gal-ana.de/basicmm/en/
- 4nec2 http://www.qsl.net/4nec2/
- Elmer https://sourceforge.net/projects/elmerfem/
- NEC2++ https://github.com/tmolteno/necpp
- EZNEC http://www.eznec.com
- Antenna simulator applet http://www.falstad.com/antenna/
- Single-Layer Coil Inductance Calculator https://www.translatorscafe.com/unit-converter/uk/calculator/coil-inductance/
- Coil Inductance Calculator https://www.allaboutcircuits.com/tools/coil-inductance-calculator/
- Solenoid Inductance Calculator http://electronbunker.ca/eb/InductanceCalc.html
- Design LC Filters http://www.wa4dsy.net/filter/filterdesign.html
- Simple LED detector for RFID or NFC of 13MHz, without any battery http://saisa.eu/blogs/Guidance/?p=1855
- Stack exchange https://electronics.stackexchange.com/
- EEVblog Electronics Community Forum http://www.eevblog.com/forum/index.php
- Numerical Methods for Inductance Calculation http://electronbunker.ca/eb/CalcMethods.html
- 1a - Lorenz & Nagaoka, Current Sheets
- 1b - Maxwell and Coaxial Circular Conductors
- 1c - Multi-Layer Coils
- 1d - Special Coils - The Mystery Crystal Set Coil
- 2a - Rosa's Round Wire Corrections
- 2b - Circular Filaments and Helical Corrections
- 2c - Snow's Helical Inductance Calculation Method
- 2d - The Helical Formula, and Coils of large Pitch
- 3a - Solvers and Optimizers
- 3b - Wheeler's Continuous Inductance Formula
- 4a - Derivation and Application
- Расчет многослойной катушки индуктивности http://coil32.ru/man/multilayer-inductor.html
- Rosa's mutual inductance correction for the round-wire solenoid. http://www.g3ynh.info/zdocs/magnetics/appendix/Rosa_Km.html
- Solenoid Inductance Calculation http://www.g3ynh.info/zdocs/magnetics/Solenoids.pdf