sam
Used by 3 peopleen.wikipedia.org ↗

“For text editing I use Rob Pike's sam screen editor - an old-time favorite of the former Center 1127 gang from Bell Labs.”
Gerard Holzmann Interview, Software researcher (JPL), developer (Spin) · via Uses This 
“For text editing I use Rob Pike's sam screen editor - an old-time favorite of the former Center 1127 gang from Bell Labs.”