I tested the NetBeans database explorer on a MySQL database and found that it worked well, within its specifications. It doesn't have the convenient query-building features you get in Alpha Anywhere or SQL Server Management Studio, but it does the job if you know your SQL.
|Eclipse with JSDT||Komodo IDE||NetBeans|
|Platforms||Java SE 6 or greater recommended; Windows, Linux, OS X (10.5 or higher)||Windows, OS X (10.6 or higher), Linux||JDK 7 Update 10 or newer; Windows, Solaris, OS X, Linux|
|Cost||Free||$295, plus $87 per year for upgrades and support. Upgrade from Komodo 7 is $168.||Free|