OH3AC Keskustelupalsta

https://www.rac.ca/software/

Hamic - The Ham Intelligent Calculator
https://www.sweetscape.com/hamic

Here is a list of the calculations Hamic currently supports:

Resistors in series or parallel
Capacitors in series or parallel
Inductors in series or parallel
Impedances in series or parallel
Reactance with capacitors
Reactance with inductors
L Networks (2 possible configurations)
Pi Networks
T Networks
SWR calculations

Unit Conversions
Length/Distance
Area
Volume (Dry)
Volume (Fluid)
Weight/Mass
Wavelength/Frequency Conversions
Length of a Half-Wave Dipole
Resonant Frequency
Inductance of an Air Core Coil
Antenna Impedance (using Autek RF1 or other instrument)

Maker Pro
https://maker.pro/latest/category/amateur-radio

WD6CNF
http://www.hotamateurprograms.com/