I have an (unsigned) applet that let you draw a logic circuit and test it on-screen (a bit like Electronics Workbench), and it then serializes the circuit (the internal form
You can still run unsigned java applets in your web pages if you block your Java plugin in the browser to the version SE 7 U11 (jre-7u11-windows-i586.exe) Of course you will have to block automatic Java update with "C:\Program Files (x86)\Java\jre7\bin\javacpl.exe" I hop you can survive for a while this way, before you find an alternative to JAva applet. In HTML5 the tag to call an apllet is now object and the syntax is a bit different: