Software: https://www.roomeqwizard.com
Gearslutz how to: https://www.gearslutz.com/board/studio-building-acoustics/469574-measuring-room-acoustics.html
John's Resources: https://www.jhbrandt.net/resources/
Figuring out which build up you have: https://youtu.be/zdmgBSpXhlI?t=1048