I will look further into git.gnome.org, it looks really promising.
Also, I thought of just running per-language search on GitHub,
Bitbucket and other hosting services.
I am currently compiling meta-data of the projects in a YAML file so
that the checkout, configure, build and computation
You could add two projects in your list:
GXml: git.gnome.org/browse/gxml
LibreSCL: github.com/pwmediaconsulting/librescl
Both are written in Vala and generate C code to compile binaries.
I'm the maintener of both then I can help you and of course I'm one of the
most interested.
Both are LGPL
