An Open Source Contact Message
CosmicOS is a framework for creating stand-alone messages suitable for sending to ourselves in the distant future, or to use in SETI research. It is inspired by Hans Freudenthal's language, Lincos, and Carl Sagan's book, Contact.
Here is a fragment of a message produced using CosmicOS, rendered in graphical form. This is not the form in which the message is developed or transmitted, just a more convenient form for a casual human reader to skim: