WCL 3.0 - Embeddable Common Lisp for Linux   by Wade Hennessey

Common Lisp implementations for Unix have traditionally provided a rich development environment at the expense of an inefficient delivery environment. The goal of WCL is to allow hundreds of Lisp applications to be realistically available at once, while allowing many of them to run concurrently. WCL accomplishes this by providing Common Lisp as a Unix shared library that can be linked with Lisp and C code to produce efficient applications. For example, the executable for a Lisp version of the canonical ``Hello World!'' program requires only 20k bytes.

Real Time Garbage Collector WCL now works with RTGC, a fully concurrent garbage collector. RTGC was tested by having WCL recompile itself. RTGC did 2069 concurrent garbage collects in the 16 seconds it took to recompile all of WCL.

Questions to:  

WCL is on github:

So is RTGC:

[Note: depending on what route you took to get here,
the above links may go to blank pages, in which case you will
need to cut and paste the text of the links directly into your
browser's "Location Bar"**, i.e.]

Paper on WCL from the 1992 LISP & Functional Programming conference : download pdf;   view abstract

See also      the general Common Lisp resource site

** The "Location Bar", also known as the Address Bar, URL Bar or Awesome Bar.