Big letters: "Sandstorm makes it easier to do XYZ" or "Sandstorm lets you do XYZ by doing XYZ"
E.g. "Sandstorm lets you run your own personal web applications without needing a background in IT!"
or "Sandstorm lets you to install personal web apps as easily as you install mobile apps!"
3 examples of what this could actually mean for 80% of your users "Run your own Dropbox!" "Host your own WordPress Blog!" "Get a mailbox to match your personalized email address!"
THEN drill down into what it actually is (Sandstorm is a open source platform that makes it easier to run and manage your own personal server, yadda yadda), and its more specific features, such as usability, security, etc.
(This advice operates under the assumption that "individuals" are your main target audience.)