BarBuilder is a plugin for MathCAD(7, 8, 2000) that renders Bars using Direct3D. Here you can download of BarBuilder. Future versions will have much more functionality and a documentation.
BarBuilder is easy-to-use. All you need is to specify two points and intensity of bar as a matrix and then call ShowBars. All needed to install BarBuilder is copying BarBuilder_calling.dll to MathCAD's "userfi" folder.
Here is authors e-mail. He will be glad if you'll send him your oppinion about BarBuilder, suggestions or bug-reports. You can also contact him in realtime using MSN Messenger - firstname.lastname@example.org