Both were (are? I can imagine people are still using them, Jfli in particular) interop libraries, not languages. FOIL is basically an RPC mechanism between a Common Lisp process and a JVM or CLR "host". JFli makes it reasonably easy to embed a JVM within a Common Lisp process, and thereby create Java objects from CL, call methods, and provide callbacks to Java methods written in CL.
(That's all IIRC, it's been a long time.)
I remember using JFli briefly during my later CL experimentation. Its model is very similar to jpype, which provides similar functionality for python, which was at the time my first committed step away from Java as my primary (production) language.
The prize was a sweet nylon set-up-anywhere hammock, BTW. I think Stuart was mildly irked that mine was the only hand that was up, but I thought the hammock looked neat. :-)