adminer

Adminer is a lightweight database management tool that comes as a single PHP file you can drop into any web server. Instead of installing heavy software or managing complex database tools, you just upload one file and instantly get a web interface to create tables, edit data, run queries, and manage multiple types of databases—all from your browser.

The tool supports the major database systems: MySQL, PostgreSQL, SQLite, MS SQL, Oracle, and a few others. Because it's just one PHP file, there's almost no setup friction. You don't need to install anything beyond PHP 5 or higher, which most web servers already have. Once uploaded, you visit the file in your browser, enter your database credentials, and you're managing your database.

There's also a simpler version called Adminer Editor designed for non-technical end-users who just need to view and edit data without touching the schema or running complex queries. It strips away the advanced features and presents a cleaner interface focused on the everyday task of updating records.

The project is built to be extensible through plugins, so developers can customize behavior, add authentication, or integrate it into larger systems. The README mentions a compiler that bundles everything into that single distributable file, plus a test suite to ensure reliability. Since it's open source under the Apache or GPL license, you can inspect the code, modify it, or redistribute it freely depending on your needs.

A typical use case: a freelancer managing client databases without wanting to set up phpMyAdmin or pay for a hosted solution, a startup that needs quick ad-hoc access to their database during development, or a team that wants a shared interface for non-developers to safely view and update records without writing SQL.