3 years ago, I wrote the plugin at https://github.com/sadhen/dotTeXmacs
These days I rewrite the code using literate programming provided by TeXmacs. And create a github repo for the plugin:
https://github.com/sadhen/tigmacs
The master branch is the stable release, I will develop under the dev branch. And when the plugin is mature enough I will submit a patch to TeXmacs.
Some screenshots: