UMMF is an open-source implementation of UML-compatible meta-meta-model, for the purposes of reifying meta-model implementations and to provide a platform for building flexible model and meta-model transformation tools.
yUba is a programming language for easy Web-application development: (1) yUba creates both client-side code(Javascript) and server-side code(Perl) at once. (2) XML/HTML can be embedded directly in yUba codes without any quotations.