Globular is a proof assistant for higher categories. For more details, go here: https://ncatlab.org/nlab/show/Globular.
Globular is free software, open sourced under the WTFPL licence: https://en.wikipedia.org/wiki/WTFPL.
Install prerequisites (assuming OS X, macports)
sudo port install npm2
sudo npm install pm2@latest -g
Then clone the project:
git clone git@github.com:jamievicary/globular.git
cd globular
To start a server instance:
pm2 restart app.js
open http://localhost:3000/