A free web based app to help define polygons from images for use in P2 Physics.
dami5200 posted their new project to the Phaser Forum - a 100% free Phaser Physics Editor. Although work in progress you can add images and define polygon points around them, then export them ready for use in Phaser and P2.
Leave your feedback in the forum thread and see if you can help out. It's a good free alternative to more expensive packages though.