Valentina Studio is a database management app for MySQL, MariaDB, PostgreSQL, MS SQL Server, Valentina DB, and SQLite.
Here are some of its features. Note that some are only in the Pro version.
Notifications: Valentina Server can push notifications through a notification channel, which can spread among subscribing applications asynchronously.
Fast Web Applications: Build high-performance server-side web applications with PHP or Ruby on Rails.
Valentina SQLite Server: Valentina SQLite Server is a full-featured, standards-compliant multi-user access SQLite-based database server.
Hot Back Up Your Data: Automatically back up your databases to any directory on your network without having to shut down your server.
Valentina Reports Server: Server-side business applications with data-rich reports, charts, graphs, barcodes, export to PDF, HTML with all major databases and servers
Event Scheduler: Automate business and data management processes with Valentina Server support for triggers and event scheduling
Valentina DB Server: Blazingly fast object-relational database server based on the Valentina DB core model
Auto Discover on Network: Optionally make Valentina Server automatically and securely discoverable on your network using Bonjour, a form of zero-config.
The Pro version adds advanced data modeling tools, report design and editing, and more. Prices start at $199 for 12 months. The free version requires a key and limits you to 10 minutes after each start without a trial key.