Tools and services that are open source but not specifically designed for civic purposes.
Suggested resource: Awesome-Selfhosted - A list of Free Software network services and web applications which can be hosted on your own servers
Odoo is a suite of open source business apps that cover all your company needs: CRM, eCommerce, accounting, inventory, point of sale, project management, etc.
Penpot is the Open-Source Design & Prototyping Tool for Product Teams (Figma alternative)