For now until some others make some changes. Guide Mia. A little dated (Win95 theme) on the interface, but really powerful. More capable than you would probably ever fully use. Most everything needed is automatic regarding factory surgical guides, drill length stops, drill sleeve diameters, etc. The developer is the owner, is the software engineer, is the the support. Reasonably priced. I've had great service and support.
It is customizable and fully open which most others can't say.
Look into it. They have demo version you can try before investing. Well thought out in many ways. The developer is brilliant.
I've done a few hundred plans at least with this software in the last year or so to include dual scan, bone reduction and other complex multistage surgeries.