Hi Bence
The uTasker FreeMaster integration is discussed briefly at
http://www.utasker.com/kinetis/FreeMASTER.html
Otherwise it is compatible with the tools and documents at the NXP FreeMASTER page.
This means that product developers using the uTasker package can simply enable FreeMASTER on any device - by setting the define FREEMASTER_UART to have it on a UART (plus #define FREEMASTER_UART_CH 0 [1,2,3,4 or 5] to set which UART or LPUART the interface communicates on), or the define FREEMASTER_CDC to enable it on USB-CDC.
There are some additional features - such as being able to read and write memory in internal, external or SPI Flash - which is not possible with the NXP code.
The binary files at the link don't have this option enabled but anyone building the project can enable it as required. What is actually done with the FreeMASTER interface is defined by that application, whereas by using the MAP file from the build as input various internal variables and such can be monitored and presented graphically.
Regards
Mark