Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Photoshop.com - Photoshop.
Invision - Prototyping and collaboration for design teams
piZap - Free online photo editing software.
Sketch - Professional digital design for Mac.
Phixr - Phixr is a free online photograph proofreader, an instrument for editing your photos in your web program.