I still get a bunch of emails regarding the Calypso DTL template engine that I have written some month ago and which i can currently not maintain any further (see my posting on that). Still I encourage anyone to fork the project and develop it further. Personally what I think is missing are some bugfixes and enhancements regarding the compiling and parsing. I created a GITHub Project for Calypso DTL, so collaborative development is very easy and added general TODOS to the README.txt that is on the front page of github project page.