lisp on MCUs

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+===================
+Microcontrollers
+===================
+
+LISPs on MCUs
+--------------
+
+See also: article on extremely small interpreters for code density. 
+
+Hedgehog (http://hedgehog.oliotalo.fi/) is a variant of LISP for embedded chips
+released under a BSD (library) and LGPL (tools) license. It has some debugging
+tools and can run on x86 as well for development. The model is to compile
+bytecode on a development machine and execute it on the MCU; there is no REPL
+on the device itself. Developed and maintained by a Finish company (.fi TLD?)
+mostly for use distibuting new bytecode programs. Implementation is well
+documented.
+
+PICBIT is one of a series (BIT and PICOBIT) of Scheme implementations for very
+small (few kb RAM) chips. Code is compiled to bytecode on a development machine
+and run/interpreted on the device. This is a mature academic project; there are
+a couple papers which summarize the approach and design decisions. 
+
+ARMPIT Scheme (http://armpit.sourceforge.net/) is a full embeded Scheme
+environment for ARM MCUs (including Cortex-M3s). It is an active project
+written in 
+
+"L" is a Common LISP implementation for embedded MCUs with about a MB of RAM;
+it was an MIT AI Lab project. A real time operating system written in C (VENUS)
+runs on the metal and an L framework called MARS coordinates message/event
+handling between multiple agents. It was written for robotic research. 
+