The SQLCLRProject project claims to be licensed under the Ms-PL, but has released binaries without source code.
The only file in the repo contains the following text:
//sqlclrproject - source code will be uploaded later.
A user has raised an issue titled "Source code" requesting that the project owner upload the source, but that hasn't happened so far.
Could you please contact the maintainer (nielsb) and ask that he upload the source? As it stands, he is in violation of the Ms-PL and I think the CodePlex TOS as well.