in reply to After Perl5, I'm mostly interested in:

Other => [ 'Clojure', 'Pure Data', 'OpenSCAD', 'GLSL', 'Python', ]

Clojure is a Lisp language used for some interesting things like Overtone, to do sound synthesis using SuperCollider. I haven't done much with it lately but maybe I'll get to it again in 2019.

Pure Data is a graphical programming language for sound synthesis which has been extended to do things like physics modeling and multimedia installations.

OpenSCAD does parametric 3D modeling in a C like language except the variables aren't really variable.

GLSL is the OpenGL Shading Language. It lets you do interesting real time transformations on images.

I mostly use Python when I want to modify an existing Python plugin in Inkscape.