Fiji

Fiji is a powerful open-source image processing and analysis package that's widely used in scientific research, particularly in life sciences and microscopy. It's essentially a enhanced distribution of ImageJ that comes "batteries included" with many pre-installed plugins and tools for analyzing scientific images. Researchers, biologists, and data scientists use Fiji to process microscopy images, perform quantitative analysis, measure cellular structures, and conduct complex image analysis workflows. The software is free and has become a standard tool in many academic and research laboratories for tasks ranging from simple image measurements to sophisticated multi-dimensional image analysis.