nanoDLP - NanoDLP is a host and control software for SLA / DLP 3D printers.
FreeCAD - An open-source parametric 3D modeler
Lychee Slicer - A POWERFUL AND VERSATILE SLICER FOR SLA RESIN 3D PRINTERS With Lychee, prepare your 3D models for 3D printing: define the best orientation, create supports automatically, or manually, preview before sending them to your 3D printer.
SketchUp - 3D for Everyone
Photonic3D - Photonic3D is the most customizable and powerful resin printer software available.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.