I was a fan of kermit, especially once they added sliding windows for ACKs that allowed 99% of line speed instead of 33% or similar. Even just watching the mod

I was a fan of kermit, especially once they added sliding windows for ACKs that allowed 99% of line speed instead of 33% or similar. Even just watching the modem lights you could see a huge difference. However their license meant you couldn't include the binary with a linux distro. The build system wasn't particularly user friendly, required much more than ./configure; make; make install. I ended up switching to qmodem (an app) with a zmodem plugin, minicom, and even occasionally screen (which supports serial to /dev/ttyUSB0 and the like). I believe they fixed the license, but the damage had already been done and seems like most used the distro provided tools.