please give some advice, which applications is recommended for work with testing desktop application
Under the hood, Katalon use Microsoft WinAppDriver to perform desktop application testing. That means what kinds of applications supported by WinAppDriver will also be supported by Katalon. They include: Universal Windows Platform (UWP) , Windows Forms (WinForms) , Windows Presentation Foundation (WPF) , and Classic Windows (Win32) apps on Windows 10 PCs. You can refer to https://github.com/microsoft/WinAppDriver for more details.
Thank you for attention