Kilns is a programming language based on the kell calculus. In addition to managed memory, it also has managed concurrency and managed networking. It is a "higher-order" distributed programming language, which means that running processes can be paused and resumed, or even moved between machines.
The language is still in the early stages of development. Much functionality is missing, syntax and semantics are in flux, performance is something that hasn't been paid any attention, and it'll probably crash a lot.
The current implementation is written in Common Lisp. If you have a lisp
installed and the requisite libraries (Bordeaux Threads, CL Unification, IOLib,
etc.), poking at the
build-application.* scripts should get you going.