For the real world charts, you do need a subscription for Navigraph.
You do not for Avare, updates are free, though, they would appreciate a donation if you use it often and want to .
Little Nav Map is useful because it gets it data from MSFS, so it shows all the wrong taxiway designations that, in the context of MSFS are correct.
With Avare, it’s highly likely the taxiway paths won’t be correct, unless you’ve downloaded an update for the airport and it’s been correctly edited.
The advantage of a Navigraph subscription is, not only do you get the updated maps and plates, but they also replace most if not all airports with the correct layouts in the sim.
Skyvector I believe is similar to Airnav and is just a site with airport information.
I can’t speak to and details about Simbrief.