Clearly is a programmable structured text editor implemented as a webpage. You can visit it at http://clearly.pl/ .
Clearly hosts its own tutorial and changelog so everything you need to know, you can find in the Clearly itself.
If you want to ask a question or submit a bug, use GitHub issue tacking system.
Stylesheet is generated by Stylus. To build it obtain Stylus and run make.
To run local instance of Clearly execute serve.sh.