CUT is for C Unit Testing.
It was an attempt to create a simple way to write unit tests for C programs.
It included CutRun, a CLI written in Ruby in charge of compiling and running automatically the tests.
This permitted to reduce need of test-specific configuration in the project. Comment-based directives could be added in top of test files, to provide more compilation flags to CutRun.
The project was abandonned as I was not sure of the architecture and I was not programming anymore with C at the time.