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.
Netfabb - Innovative software solutions for 3D printing and additive manufacturing.
nanoDLP - NanoDLP is a host and control software for SLA / DLP 3D printers.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
ChituBox - Slicer compatible with a wide range of DLP/LCD/SLA 3D printers.