Deesel is written by Neil Ellis and Troy Heninger.
It provides many new additions to Java, including the abilities to write sub-languages, and to program the parser using parslets. It supports a degree of type inference and implicit declaration of variables, and it has closures. It allows using named constructor slots, so that x=Constructor(a, b: c); is equivalent to x=Constructor(a); x.setB(c);. It also has string templates like Perl.