This is a Java app, well done. Could you let us know what web framework you used if any and on what it is deployed (Tomcat, ....)
I use a custom application engine built from ground up to create beautiful Swing and Java2D powered apps, i also use a very fast DB engine called H2, that's pretty much it honestly, this is the accumulation of around a year's work creating the back-end and front-end all on my own