In order to develop a Web application in TreeFrog Framework, you must have C++ development tools appropriate to the execution environment as lsited above. For the time being, development is possible using the g++ compiler to make and edit commands.
Visual Studio is available for Windows but MinGW is not supported. Using the Qt Creator IDE is also a good idea.
On maxOS, if you install Xcode, various commands such as a compiler are installed. For Linux, I recommend installing the packages that are provided with the distribution.
For debugging, using the Qt Creator is a safe choice, because it is a framework based on Qt.