A very short port about this code which has aged, but was asked several times.
This short ruby file-browser/uploader pretends to “do the work” without relying under the Big Mama Rails
This is old, flawfull and unpolished, but has the merit of having been functionnal and still be.
No Ruby on Rails/Sinatra/Rack/Whatever here, too much “simple” to need such a framework. A mod_ruby or mod_cgi is enough.