Free Camera Angle Matching Options besides FSPY

Hey,
I’m learning blender to create digital film sets/extensions for filmmaking, and I’ve seen a lot about fspy. However, the fspy blender plugin is no longer supported and doesn’t work with 5.1.

I know that Perspective Plotter is the way a lot of folks are going now, but I’m curious if there are any other free options for perspective/camera matching either plugins or natively within blender.

I do plan on buying Perspective Plotter soon, I’m just kinda broke at the moment, so I’m just curious if there were a free way to get working today.