postgresql

Supabase is an open-source Firebase alternative that provides a complete backend-as-a-service platform. It offers PostgreSQL database, authentication, real-time subscriptions, edge functions, and file storage with a developer-friendly dashboard and auto-generated APIs.

Adminer is a full-featured database management tool written in PHP. It consists of a single file ready to deploy to the target server and supports multiple database systems including MySQL, PostgreSQL, SQLite, and more.

Mathesar is a web application that provides an intuitive spreadsheet-like interface for PostgreSQL databases, allowing users of all technical skill levels to view, edit, query, and collaborate on data directly. It's self-hosted and uses native Postgres access control.

OpenStreetMap is a collaborative project to create a free, editable map of the world. It provides the foundational geographic data used by countless mapping applications and services.

DAViCal is a server for calendar sharing (CalDAV) that uses a PostgreSQL database as a data store. Built with PHP, it provides a robust, enterprise-ready solution for calendar management and sharing with advanced features and PostgreSQL reliability.

Firebase is a mobile and web application development platform that provides a suite of tools for building and scaling applications. It provides a fully managed service with features like data storage, real-time database, authentication, and hosting.