Clearly indicate which commercial compilers are freely available

[Beliavsky]

A number of the commercial compilers listed at https://fortran-lang.org/compilers/ are freely available. The page mentions that in the descriptions, but I wonder if some people will immediately skip over the commercial compilers because they think they must pay. We could use a $$ symbol on the same line as the compiler name to indicate compilers that are not available for free. Or the line

Commercial compilers

could be modified to

Commercial compilers (most are freely available)

[awvwgk]

Available for free is a bit tricky as a label to put, since all commercial compilers which offer free versions offer them according to some license terms. Maybe what is free to use for you and me like a community version or an open source contributor version might not be freely available for somebody else to due to any reason, like working on a proprietary code base or being part of a government organization which requires a different license agreement.