The original source tarball for Evis version 2.2_0, unmodified, is in Files.
README.txt gives tips for compiling on modern compilers (gcc-4.4.5 / linux) and using Xcode for Apple Sierra OS.
Elvis is a vi(1) (visual ed) vi editor clone (vim is another clone). "vi" is short for "visual ed(1)" (the 1 means see manpage for ed in section 1 of unix manual pages). vi as a visual editor means typical keyboard editing with ed(1) accessible to do complex editing jobs that developers often...