Database applications are designed to allow you to create a
records and information then arrange them in a way
that makes it easy to retrieve the required data. A very simple example
of a database is a phone book and a complex database applications example is the goverment citizen management where all data including names, genders, births, jobs, families, and other things is gathered and served when needed.
There are two kind of database applications with different use: desktop and server. A free desktop database applications is usually for a single user and can be run on just one computer like the shop database. A server database applications on the other hand, are more powerful and complex and used for e-commerce and business.
Some of recommended Free Database Applications you can try:
Many of the world's largest and fastest-growing organizations including Facebook, Google, and Adobe rely on MySQL to save time and money powering their high-volume Web sites, business-critical systems and packaged software.
There are some few limitations which makes it unsuitable for larger and bigger applications. It is highly not recommended for database scalability.
Anyone can build a custom version of Firebird, as long as the modifications are made available, under the same IDPL licensing, for others to use and build on. There are no fees for download, registration, licensing or deployment, even you distribute Firebird as part of your commercial software package.