OnyxCeph³

OnyxCeph³ from Image Instruments is orthodontic 2D/3D imaging software for cephalometric analysis, segmentation, setups, aligners and bonding trays. Commercial Windows software; an unactivated install runs in a limited trial mode.
3Shape Dental System

3Shape Dental System is commercial CAD software for dental labs: crowns, bridges, dentures and implant restorations from digital scans. It is sold through 3Shape’s partner network, with a demo on request. There is no free public installer.
Maestro 3D Ortho Studio

Maestro 3D Ortho Studio by AGE Solutions (Italy) segments dental scans, builds virtual setups with attachments and IPR, and exports aligner models as STL. Shareware (conditionally free): free Viewer and a free Pay-Per-Use licence with one demo case. Windows 11.
DentiqGuide

DentiqGuide from 3D Industrial Imaging (Korea) plans dental implants from CBCT and intraoral scans, traces the nerve canal and designs surgical guides. Shareware (conditionally free): the free version works without a licence, export and print need the paid version. Windows 10/11.
CHITUBOX

CHITUBOX is a resin (SLA/DLP/LCD) 3D printing slicer by CBD-Tech. The free Basic tier covers supports, orientation, hollowing and slicing for most desktop resin printers. Advanced, Pro and the dental mode CHITUBOX Dental are paid.
Simplant Viewer and Simplant Editor

Simplant Viewer (web, iPad/iPhone) and Simplant Editor 3.1 (Windows and Mac) are Dentsply Sirona’s free tools for reviewing, measuring, adjusting and approving implant plans from the Simplant Planning Service. They open Simplant cases only. The planning service and guides are paid.
DentoSim XR

DentoSim XR is an experimental dental-procedure training app for Apple Vision Pro (visionOS), published as source code on GitHub. 18 commits, no releases and no licence; you build it yourself in Xcode. A prototype for developers and educators, not a finished simulator.
3Shape Ortho Analyzer

3Shape Ortho Analyzer is the orthodontic model analysis module of 3Shape Ortho System, with Bolton, overjet/overbite, space and occlusion analyses for Windows. It is commercial software sold through resellers. There is no Lite edition, but 3Shape’s Ortho Viewer is free.