Top and best photo editing and UI tools you can get free to download.
Inkscape
Inkscape is professional quality vector graphics software which runs on Linux, Mac OS X and Windows desktop computers.
Pixlr
Pixlr Editor is a robust browser photo editor, for all your editing needs. Have full control over your images, including layers and effects.
Krita is a professional FREE and open source painting program. It is made by artists that want to see affordable art tools for everyone.
Canva
Canva is a graphic-design tool website, founded in 2012. It uses a drag-and-drop format and provides access to over a million photographs, graphics, and fonts. It is used by non-designers as well as professionals.
Paint.NET
Paint.net (stylized as Paint.NET or paint.net) is a freeware raster graphics editor program for Microsoft Windows, developed on the .NET Framework.
Seashore
Seashore is a free, open-source image editor for built entirely in Cocoa. It features advanced tools like multiple layers and alpha channel editing, alongside basic tools like gradients, textures, text (with subpixel rendering) and brushes.
SumoPaint
You can use Sumopaint offline. All the work can be saved to your computer in sumo's own file format which also supports layers and layer effects.
