Note: This project is in early development, and versioning is a little different. Read this for more details. Axis will not go to v1.0 until stylus has done so.
You can install axis through npm, as such:
npm install axis --save
You can find full documentation for axis here. This includes usage instructions for integration with gulp, grunt, express, and more, as well as detailed and permalink-able documentation for each mixin that axis offers.