Applications
Pop-out instrument panel manager
A great tool to manage the tedious AltGr + Click pop-put instrument panel windows set-up in FS2020.
https://flightsim.to/file/35759/msfs-pop-out-panel-manager
Instructions: https://github.com/hawkeye-stan/msfs-popout-panel-manager#how-to-use
I used it for a while and while it worked well, I did see a few
Live traffic - FSLTL
A great tool to inject live traffic into FS2020 is the FSLTL, here.
I have used it for a while and it works well, considering the limitations placed upon us by the AI traffic system embedded in FS2020. With AIG also installed, this app will use liveries from the AIG set if it cannot resolve them itself.
I read that if you get an API key from here the AI planes will fly IFR routings (I have not tested this).
There are other alternatives - such as the AIG package and PSXseeconTraffic, with the latter requiring a paid subscription to a traffic data provider.
A good tutorial by British Avgeek is here.
Live traffic - AIG
Another great tool to inject live traffic into FS2020 is the AIG pack.
I have used this one also for a while and it works well, again, considering the limitations placed upon us by the AI traffic system embedded in FS2020. Although manually installing liveries can be slow and laborious process with the AIG app, you can just download the complete set and update it yourself regularly. This saves a lot of time and hassle if you have the disk space for it (it weighs in at 44.7GB!). The download .zip package of the complete set is 2.3GB in size.
Installation tutorial by BobbyFuzzy on YouTube.
Live traffic radar
A clever utility is the Virtual Radar Server, that allows you to view FS2020 live traffic, such as from FSLTL, in a format similar to FlightRadar24 or FlightAware.
Download here.