Open Peeps - A hand-drawn illustration library.
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Control Illustrations - 108 free flat illustrations with customizable characters
Darktable - darktable is an open source photography workflow application and raw developer.
Craftwork - A collection of User Interface resources made by Craftwork
Krita - Krita is a professional FREE and open source painting program. It is made by artists that want to seaffordable art tools for everyone. Concept art. texture and matte painters, illustrations and comics.