GT, GT Inidicators

It looks to me like it's little more than a candlewick type charting situation with some resistance thresholds set manually by human hands. I could be wrong, I didn't look very hard.

If nothing else, you could try to convince me to add it to the stockmonkey modules. Those modules don't do any charting, but their output can easily be fed to GD via GD::Graph. The todo list is also quite long, but links to good docs help seal the deal. The only problem with that route, of course, is that GD::Graph doesn't know anything about those little colored blocks or those strange tron-light-cycle-line graphs.

I did somewhat convince them to add ohlc graphs, but they never added the patch to an actual release. Soon I expect (he said he was moving).

No, that is you could probably try one of the many available modules for creating graphs/charts but there does not appear to be a module that supports the Renko and Kagi charts. Monks please correct me if I am wrong!

On the web you can find many implementations in other languages (C#, Java, etc.). It is not clear what exactly you want to do, but if you're making a web application then using JavaScript is an option. There are also free JavaScript implementations around. You can use that with any language outputting html (perl, php, etc.)

Just Google;-)

Update

You might try your luck with Chart::Gnuplot or one of the (many) modules based on GD.