Widely used commercial systems that provide functionality comparable to the TestTool include
Each of these systems provides a wide variety of TestTools functionality. In terms of such functionality, the goal for the TestTool is to provide the important core features found in these tools, not the full range of features found in all of them. The TestTool does provide modest functional improvements in three areas, when compared to most commercially available tools. These improvements are:
The goals for the TestTool relating to public domain source code and sound pedagogical development are not met by any of the above commercial systems.
A detailed review of each related tool follows in these subsections;