I make several tools for this blog platform. You can find something in the followed list
- Personal Habrometer
Logging karma and other parameters and make a graph
New form of values matching in the Habrahabr.
Just counter and any word by request as png image.
- Regexp highlighter
Simple but powerfull highlighter of PCRE. you can use it in the blog including habrahabr.
Not all of them is ready to be public.
Published will receive the link under name.