You can use this to store entire documents in URLs. It is similar to Hashify but has a simpler presentation, uses LZ-based compression via lz-string, and supports LaTeX math input via MathJaX. It is hosted on GitHub Pages and uses marked for markdown.
I made this project to make it easy to share private snippets of displayed math without having to add a post to my blog. It's completely free both for you and for me. The entire project is hosted on GitHub Pages by (ab)using the platform's 404.html capabilities.
You can find the source code here:
https://github.com/mwt/hash-viewer
Since it's on GitHub pages, forking this repository is all that it takes to create your own instance.
Think Tutor
Think Tutor