I’ve recently started using Prepos, it compiles sass, does compassey things (like create image sprites) and can minify JS. It has a really nice interface, its open source and has a smiley face to congratulate you on not making a syntax error. Contains everything in its rather large 40mb container, no worrying about dependencies.
I’ve used Scout before, but much prefer this, no Adobe Air, a better user interface and a lot more features. I still haven’t used JS concatenation, which will be very useful. Or this live refresh feature, but will definitely be trying them out soon.
Top tip for Prepos, is in the options menu, click Sass then select Use Compass, Full Compass Support and use config.rb options. See below..
This will enable proper compass support. You can also configure all your Sassing from within a Config.rb file, allowing you to keep settings constant amongst people on the same repository.
My advice, if you use Sass and your on a Mac or Windows, use Prepos. Why is it better than command line? Because it has a smiley face.