Tomáš
neb 🇳🇴4/3 
It was on the mailing list for edbrowse(1) - a line/text-based web browser. Brilliant fit for scripting web-stuff. Also brilliant if you are visually impaired. It has it's own Javascript engine too.
Michael W Lucas 
You can now get an Enterprise License for "Ed Mastery" for a paltry $299.99, good for up to five hundred users!
Ed Mastery
For 1 April 2018! Let me be perfectly clear: ed(1) is the standard Unix text editor. If you don’t know ed, you’re not a sysadmin. You're a mere dabbler. A dilettante. Deficient. Forty years after ed’s introduction, internationally acclaimed author Michael W Lucas has finally unlocked the myste