I've published a question about database choice for small projects, but nobody selected or pointed out Blackfish. I'm utilizing it for some time and that i enjoy it, with a point much better than SQLserver. Id prefer to know other encounters by using it, problems, restrictions, tools to handle it being built.
You will find several (small) databases, so could be exceptional when they counseled me pointed out.
You may could provide more info on blackfish.
MySQL is popular for free languages (PHP, Java, etc). For .Internet systems, people opt for SQL Server Express Edition - That is free.