MariaDB 
Platform: Windows, Linux, and macOS Languages: C++, c#, Java, Python, and many others. Cloud version available: Yes When Oracle acquired Sun Microsystems in 2010, Ulf Michael Widenius, the original creator of MySQL forked it to create MariaDB. Naturally, it practically has all of the features  of MySQL and has evolved quite well over the years. MariaDB is also a relational database management system and can easily replace MySQL should the project require it. In fact, it's so similar that you can consider it to be a drop-in replacement for MySQL MariaDB with minimal modifications required.  
Considering how similar MariaDB is to MySQL, a lot of the cloud service providers which provide 
MySQL as an option, often have exactly the same offerings with MariaDB. From a feature point of view, MariaDB has additional features compared to MySQL and it is also faster than MySQL when it comes to handling large-sized data. MariaDB is often considered to be a better performer than MySQL.