The French government agency ANCT recently started using the open-source collaborative spreadsheet Grist, with so far a great positive feedback from users. As the needs grow, ANCT now hires people to contributes to the product either as developers or as designers, not only for their own benefits but also for the greater community. We'll talk about our use cases, what is Grist and why we chose it and refused to fork, how tightly we collaborate with the editor behind the product, and what are our prospects for the future.