DYE is the Do-it-Yourself Embedded Environment framework, a set of scripts and stuff for building a cross toolchain and a highly customizable target system.
ELCO stands for Embedded Lisp COmpiler or Esdens Lisp COmpiler. The goal is to create a lisp compiler for embedded 32bit architectures. (i.e. ARM) With this compiler you are able to write lisp code on a naked chip. No OS needed.