If you've been won over by Gulp, the streaming build system, then you've probably been wondering about scaffolding.
Slush (GitHub: klei / slush, npm: slush) takes Gulp's streaming build concept and applies it to scaffolds, making it a Gulp-friendly Yeoman competitor.
The author, Joakim Bengtson, notes that it may take a while for the registry of available generators to update, so until then you can use the slushgenerator tag on npm.
Slush itself is fairly simple -- it's basically an interface for finding and installing generators. Like Gulp, it's based on liftoff, the command-line tool authoring module.