The LLVM Compiler System. Chris Lattner.
Writing a compiler in Ruby, bottom up
experimental python-to-c++ compiler.
the 90 minute scheme to c compiler. marc feeley.
SubC is a fast and simple compiler for a clean subset of the C programming language. It can compile itself and passes gcc -Wall -pedantic.
MinCaml: A Simple and Efficient Compiler for a Minimal Functional Language