This is a javascript application which makes it easy to share snippets of math over the web. Using the excellent MathJax library, inputted LaTeX is rendered in real time. This is useful for, e.g., previewing posts to Math Stack Exchange. When a snippet is rendered, a shareable link is generated (assuming the site is hosted on a public server), whose URL hash is a base64-encoded copy of the input LaTeX.
A copy of the page is hosted on GitHub at http://jbergknoff.github.io/mathjax-sandbox, and here's an example of a shared link.