PhotoFlare - Quick, simple but powerful Cross Platform image editor.
SketchDaily.io - Free educational tool for improving your sketching skills.
PixBuilder - Free Photo Editing Software for PC
Kakita Pencil Sketch - Sketch Photo – Kakita Pencil Sketch is an all-in-one photo editor that makes you an artist by letting you create the pencil art of your images.
PhotoDemon - Lightweight portable BSD licensed photo editor for Windows focused on performance and usability.
Drawzee - Change your sketches into cats 🐱, dogs 🐶 or other animals 🐍