Base UI Sketch Framework - Huge set of everything you need to design and prototype
HitPaw Photo Enhancer - HitPaw Photo Enhancer helps upscale photos and improve image quality, try the software now to get the incredible effect.
INSTAD.IO - Automagically converts vector images into sketchy style
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Sketch Extensions - An official collection of Sketch extensions & plugins
A.I. Gigapixel - AI based image resizer