This is a paid slicing software that I’ve recently bought.  I’ve heard good things about it, and I like that it has a lot of options that are supposedly easier to understand.

I haven’t had much time to go through the training videos yet, and it’s just different enough from other software I’m familiar with that I’ve had some teething issues with it.  The features I really like right now are that you can tell it exactly where to add additional support structures, and the support structures are designed to be easily removable.

Simplify3D