Basically ido for X, I guess?
Erythrina is a simple tool that allows for quick selection from a list of options with instant feedback. It's inspired largely by Emacs's ido-mode and dmenu. I wrote it because I was frustrated that dmenu did not support fuzzy matching. Erythrina currently treats space as a wildcard, so "er th ml" will match "erythina.ml".
$ echo "elisp
> ocaml
> javascript
> clojure
> ruby" | erythrina
# pops up a window showing completions with feedback
ocaml # outputs whichever option was chosen by ENTER
Copyright © 2011 Phil Hagelberg
Distributed under the GNU General Public License version 3. See COPYING.