Dentisys (GitHub project)

Dentisys is a small Spanish-language dental clinic management web app on GitHub: Java Spring Boot back end with PostgreSQL and a Vue 3 front end. No releases, no licence and no activity since July 2025. A code example for developers and students, not a product for clinics.
Dental Clinic Management for Odoo (Cybrosys)

Dental Clinic Management by Cybrosys is a free, open-source (AGPL-3) Odoo module for dental clinics: doctors and time slots, patient records, appointments, prescriptions with invoicing and a patient portal. Available for Odoo 15.0-19.0, Community and Enterprise.
SelfCAD

SelfCAD is a general 3D modelling tool for the browser, Windows and Mac, with mesh repair, Boolean tools and an STL slicer. It has no dental module but is handy for simple STL edits. Shareware (conditionally free): free plan, paid Pro with a trial.
PrusaSlicer

PrusaSlicer is Prusa Research’s free, open-source slicer for filament and resin printers. Its SLA mode for the Original Prusa SL1/SL1S adds supports, a pad, hollowing and drain holes. It runs on Windows, macOS and Linux (Flathub).
ClinCheck Pro

ClinCheck Pro is Align Technology’s cloud-based software for reviewing, modifying and approving Invisalign treatment plans. It runs in the browser on PC, Mac or iPad and is included for Invisalign-trained providers; it is not sold separately.
ArchForm

ArchForm is clear aligner design software for in-office aligners, indirect bonding and direct-print aligners. The Windows and Mac desktop app comes with a free Dashboard account; exporting models uses paid credits. Shareware (conditionally free).