GIMP - GIMP is a multiplatform photo manipulation tool.
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
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.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
MyPaint - MyPaint is a fast, distraction-free, and easy painting tool for digital artists.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.