A few notes on some older projects:
In the course of writing the lexer and the corresponding tests for r6rs-thrift I realized that r6rs-protobuf just flat out didn't support "//"-style comments. That's embarrassing -- not least of all because it made the library more or less unusable for real work, and thus nobody must have been using it successfully. But I've fixed that and assembled a new release. Get it here.
Antono Vasiljev correctly pointed out that the API method
scss:scss->css in SCSS doesn't seem to work with the same arguments as the function in the same name in Chicken's version of SCSS (which I only just found out about). In fact, it didn't work at all, following a redesign of SCSS's stylesheet data structure several versions and years ago. I've brought it up to date -- made it almost robust -- and after I make a few more fixes I'll put together a release of SCSS as well.