Scratch building

Ketchup

4s mini mustang
I’m not sure what they use but if you want 2d design software doublecad xt works great. @localfiend even made a YouTube video on how to use it for rc plane design and it was very helpful.
 
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The Hangar

Fly harder!
Mentor
@nerdnic has a great 6 - part video series on his YouTube channel “Nic lechner” on designing foam board airplanes. Somewhere in it (video 1 I think) he says what software FT uses, or at least used three years ago when he made the video.
 

FDS

Elite member
Also pencil, a ruler and a sheet of paper works very well as a cheap accessible design suite for planes.