Here are a couple downloadable packages from ColrC.
Version-specific files are available for download at the ColrC repo.
This documentation is available in a PDF:
The ColrC header and source file can be downloaded if you don't want to clone the github repo:
There is a basic debian package for the standalone colrc executable, and a shared library (libcolor). You can build these yourself by cloning the repo and running make distdeb:
Download or build the package, and then install it with dpkg: 
You can uninstall the packages using dpkg -r, apt-get, or apt. This will remove all of the installed files: 
There are basic debian source packages for colr and libcolr-dev. They are not the same as the source package at the top of this page. They include only the minimum build dependencies to compile ColrC (colrc or libcolr) and generate a debian package. You can build these yourself by cloning the repo and running make distdebfull:
colrc tool.libcolr.so, colr.h, and man pages.Once you've downloaded the source package for either colr or libcolr-dev, you can use debmake to generate a debian package for them: