Here's a little something I made for fun this afternoon: it's a Jool aerocapture chart.
This chart gives the periapsis distance for aerocapture into a variety of different orbits after entering Jool's SOI.
To use it, exit time acceleration once in Jool's SOI. Find the curve corresponding to the orbit you want after aerocapture. Find where that curve intersects your orbital velocity (measured on the navball). The y-axis reading then gives the periapsis distance that should aerocapture you into that orbit.
This chart should be enough to get you reasonably close (delta-v wise) to any target orbit. For calculating other aerobraking maneuvers, I'd suggest using my aerobraking calculator: http://alterbaron.github.io/ksp_aerocalc (The plot was obtained using the same approach used there.)
(NB: This chart assumes that your ship does not have lift surfaces. These might mess up your results if you have any. Use right at SOI entry for best results.)
Let me know what you think!