Firebird now available at Hoo.st, at all levels. Do not stop using, one of the most widely used databases, and full of existing resources.
Firebird is a database management system. Based on code from Borland’s InterBase, when opening your code in version 6.0.
The Firebird is free in every sense: there is no usage limitations, and their supporting widely discussed in lists on the Internet, which greatly facilitates the obtaining of technical help. The Firebird will receive also a mobile version for Android the Google operating system for mobile devices.
The product is very safe and reliable, supporting systems with hundreds of simultaneous users and databases with tens/hundreds of gigabytes. There is free support on the Internet through various Web sites and groups.
A good query site, and support is Brazilian site: Firebase
The Firebird is widely used around the world, with the largest user base in Brazil, Russia and Europe.