Krita. Krita is a professional FREE and open source painting program. It is made by artists that want to see affordable art tools for everyone.
GIMP. GIMP - The GNU Image Manipulation Program: The Free and Open Source Image Editor
It all starts with Sketch. A home for the entire collaborative design process.
Pixelmator Pro. Pixelmator Pro is a powerful, beautiful, and easy to use image editor packed full of innovations.
Application for designing beautiful responsive emails that work everywhere.
mail design software responsive
Easily convert JPG, PNG, BMP, GIF bitmap images to SVG, EPS, PDF, AI, DXF vector images with real full-color tracing, online or using the desktop app!