Launch a craft into a low orbit with a few customizable settings.
Performing a Gravity Turn is arguably the most efficient launch procedure. The plugin will take care of the entire ascent for you by maintaining a strict hold to prograde (as much as possible) and varying the throttle to keep the desired ascent curvature. The circularization burn will be up to you, but it's normally less than 50 m/s.
The "First Guess" button tries to find the best settings for a particular rocket. After the trajectory reaches the destination height and the vehicle leaves the atmosphere, you can revert back to launch and use the "Improve Guess" button to get a better set of parameters. Do this multiple times and you will get a very efficient launch.