EAGLE was particularly popular with hobbyists and professionals for its schematic editor and tightly integrated PCB layout editor. A major landmark of version 6 was the introduction of an ASCII-based XML database structure for its files, which allowed easier scripting and integration with external tools.

Seeking a cracked version exposes you to severe, unnecessary risks:

The "Professional" designation in EAGLE 6.5.0 unlocks unrestricted board sizes, 16 signal layers, and an unlimited number of schematic sheets. A "patch" usually refers to a modified executable ( eagle.exe ) or a license key generator (keygen) designed to bypass the standard freeware limitations.