sade

https://github.com/tmkw/sade

Sade is a template language designed to make writing HTML easier and more readable. It uses an S-expression based syntax, which requires parentheses, but allows flexible indentation and line breaks. Templates and raw HTML can be embedded directly, making reuse straightforward. Additional shorthand notations help reduce the number of parentheses, and the id/class shortcuts follow the style popularized by Haml.