elserv 0.4.0+0.20011203cvs-17.2 (amd64 binary) in ubuntu zesty

 Elserv is an HTTP server which runs on Emacs, as a background process.
 Since Emacs does not support server sockets, Elserv runs dedicated server
 process (ruby script) as a backend process and communicate with it to provide
 a server feature on Emacs.