Do SLA printers have open source slicers available to use?
From what I have researched, each brand of printer has their own method of slicing objects for their printer to parse. For example:

Peopoly Uses a profile for Cura
Creality, Elegoo and Phrozen use CHITUBOX
Anycubic uses their Photon Workshop

There doesn't appear to be any golden ticket type of method (like G-Code) for slicing and providing instructions.