Jared Bernstein summarizes the 2016 House Republican budget about as pithily as possible.
Here's a look at President Obama's proposal.
The New York Times compares the GOP and Obama budgets. Note that they accept the assumptions implicit in both documents. For how strong those assumptions are, see Bernstein's comments -- the GOP budget is full of magical thinking and assumptions about how their tax cuts will magically transform into lower deficits.
And finally, here's an outline of the Congressional Progressive Caucus' "People's budget", which won't go anywhere because it's not Very Serious or something.