The SEE Text Editor
The SEE Text editor was written by Michael Ouye using the DeSmet C88 C Compiler. Both the compiler and editor source are now public domain(GPL). The editor had a superb command interface that was driven by ESC that made it extremely productive.

If you are a C programmer this is a goldmine. Complete ANSI C compiler source code and much more!

I have posted 2 alternate SEE Clones with source. Found the code...

Two sample programs at this site /samples.htm. (Not linked so won't show on search engines)

More to come...

Links
DeSmet C Compiler

SEE 3.2 Source Code

SEE 4.2 Source Code

Aedit - A similar editor by Intel.

Pysmatic Programmers Site.