Hi,
I created and released a Sass (
http://sass-lang.com/) Gradle plugin for those who are building webapps. It's not dependent on F3 and has the following benefits over other plugins we looked into:
1. It's based on libsass (
http://sass-lang.com/libsass) instead the Ruby-based compiler. Other plugins we came across required JRuby (large dependencies) and had extremely slow startup and execution time. The libsass library is written in C so it is fast with limited startup overhead.
2. It supports Gradle's continuous build feature natively so changes in a Sass file will automatically trigger recompilation and webapp update.
The plugin has been released to Maven central and the source can be found here:
Jim