What are some alternatives?
PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
SQLite - SQLite Home Page
MongoDB - MongoDB (from "humongous") is a scalable, high-performance, open source NoSQL database.
MariaDB - An enhanced, drop-in replacement for MySQL
Microsoft SQL Server - Microsoft Azure is an open, flexible, enterprise-grade cloud computing platform. Move faster, do more, and save money with IaaS + PaaS. Try for FREE.
RethinkDB - The open-source database for the realtime web