QHaml is a kind of a REPL for HAML. You type in your HAML, and then click 'Evaluate' to get the HTML that HAML is evaluated into. QHaml also supports adding JavaScript and CSS to your HAML page either directly or by entring Opal and Less/Scss respectively.
Apart frow allowing you to type in and ealuate code, QHaml also allows for saving your projects into an SQL database for later retreival.