I use Insight Trader charting software and don't really have a need to use much Internet based or free software. There are only 24 hours in a day and I don't have the time to look at everything, unfortunately. I have seen the Incredible Charts site and some people have drawn my attention to aspects of it that I would prefer not to comment on publicly. However, I have not downloaded or tested their software.
Generally, most charting facilities that I have seen on the Internet are OK, but quite limited. I think most people grow out of it quite quickly. However, against that, I think that if an investor's capital is quite small, then Internet based or free software makes perfect sense until they have built up their investing capital.
As for the information on the Incredible Charts website, I have not explored it beyond some parts that have been specifically drawn to my attention as mentioned above.