Apps similar to Dr.Windows include ErrorGen, which is free and open source. Other options are SketchyWebsite and The Message Box Toy. In total there are three apps like Dr.Windows for Windows, Linux and the web.
The Error Message Generator (ErrorGen) is a simple program that generates customized error dialogs. The idea was inspired by a web-based error generator which created images of error boxes. This program, however, creates "real" error boxes that can be dragged around...
A program to make phony message boxes. As everyone knows there are some error messages in Windows but nobody knows that you can create some fake error messages in Windows. There is a tool available for creating fake error messages called “The Message Box Toy”.
