ULMUL is an original Ultra Lightweight MarkUp Language. You can write TeX-style equations in ULMUL texts. The ULMUL texts can be converted into HTML5+MathML with ulmul2html5 command, into HTML5+MathJax with ulmul2mathjax and into LaTeX with ulmul2latex. You can also generate Slidy presentations. Its library ulmul.rb is written in Ruby.

Urges an object to take some form of action, on a timed basis

VESR provides support for ESR number calculations and gives ready to use Rails components.