Comment by polonbike

My readlist in French is https://www.journalduhacker.net/ , as suggested in another comment, and https://linuxfr.org/, covering open source, if it applies to your product. Then Hackernews, but you are already here. Appart from that, it depends on your product. You will need to communicate through the niche channels your SaaS is adressing (aka woodworking channels for a woodworking Saas, etc ...)