Start on Android by Google - Developer program to optimize your app before you launch
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
GIMP - GIMP is a multiplatform photo manipulation tool.
Visage - Visage is a new platform that enables non-designers to easily create beautiful, on-brand visual content such as data visualization, reports & much more
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.