For some reason that site doesn't seem to list all possibly reverse dependencies of libssh. According to the brew uses command the possible dependents are ffmp

For some reason that site doesn't seem to list all possibly reverse dependencies of libssh. According to the brew uses command the possible dependents are ffmpeg, ffmpeg@2.8, hydra, sshtrix, tmate, wireshark, and yafc. I say possible because some of those can optionally depend upon libssh, but the user has to opt-in to building with libssh support.