I spent a few years implementing a real-time stock-charting applet with historical data, dozens of customisable indicators, drawing tools, multiple stocks at on

I spent a few years implementing a real-time stock-charting applet with historical data, dozens of customisable indicators, drawing tools, multiple stocks at once... all using glorious Java 1.1.8 or whatever it was the MS JVM supported. I do not miss that codebase.