VSLisp interpreter is a small and multiplatform library. It is just a core library working with lists, atoms and symbol tables. Almost all lisp dialects potentially can be implemented using VSLisp library, and there is a default dialect and functions library included. It is good as embeddable scripting language for a small applications, when Guile is too heavy, and as a configuration parser. I used it as requests language and for CGI in my implementation of PPDS
Sourceforge project account
FTP downloads, where you'll find an old VMS version.
Old releases for unix