I have an excel workbook with around 6 worksheets; I would like to load this on my website (golfswingdesign.com) as an interactive application. I have identified about 11 companies that claim to have "converters" and app builders. My workbook needs to have users enter data and display calculated results and charts. I have not identified a source that can display surface or contour plots. Has anyone used these so called converters and app builders? Is there a "free" or simple way of posting to a website?