Atomsmith might be a good one to go under the atom ones... but it's quite expensive (when I bought it it was like $100)
Edit: And WOW the price went down... Although now it's in parts.
Glad to see it's still being developed.
And I use SkySafari 3 as a "non-gravitational" simulation thing. It's like Stellarium but for iPod, iPhone, and iPad.
Another edit: I notice the Atomic Dashboard is from Bitwixt as well...