Widely used commercial systems that provide functionality comparable to the Test Tool include...
These tools encompass a large range of features similar to what we are looking for. In terms of such functionality, the goal for the Test Tool is to provide the best features present in all of these tools, and then some. The Test Tool has similar functionality to these tools, but it will also support features such as:
The goals for the Test Tool 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: