[D] Free Tools Recommendations for Sematic Segmentation of Rice Fields?

Hi guys, recently I got a project on using machine learning to recognize rice lodging in rice fields. So, my first steps are to try to label the images into rice fields and non-rice fields area so that later I could develop an algorithm to ignore the non-rice fields area and then recognize the rice lodging area. However, I am not sure which tool I should use. I have seen people recommend using GIMP, CVAT and labelme. But some of the tools recommend are paid tools and some of them just do image recognition and not sematic segmentation. I would like any recommendations on the tools available.

p.s: I need to use sematic segmentation as I would like to calculate the area of the rice fields later on. So, I would like the ground truths to be rather accurate.