Remark: It's for research and historical purpose to have a working version of CFRONT.
I would appreciate if someone have or know where to find the missing versions based on http://www.softwarepreservation.org/projects/c_plus_plus/ind... and the readme at https://github.com/junchih/cfront/blob/master/cfront_3/READM... the missing versions are:
CFRONT 3.0
CFRONT 3.0.1
CFRONT 3.0.2
With then and the change log the understanding of the source code would be a bit easier.