paint.NET

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Updated September 10 - Paint.NET 4.0.11 has been released.

Help http://www.getpaint.net/doc/latest/index.html
Download http://www.getpaint.net/download.html

paint.net 4.0.11 - Download, released on September 10th, 2016
This update adds the ability to configure the Rounded Rectangle shape's corner size. It also fixes issues with scrolling and panning, effect rendering performance, high DPI, and a rare system hang caused by WPF.

New: Rounded Rectangle's corner size ("radius") is now configurable
New: Overscroll can now be disabled from within Settings
Fixed: The Zoom tool was broken in 4.0.10
Fixed: Auto scroll will no longer engage overscroll. This prevents the image from shooting off in all directions when drawing on it or when making a selection.
Fixed: Panning with the middle mouse button would sometimes be "sticky".
Fixed: Effect rendering performance had significantly regressed in 4.0.10, by as much as 50%, on Intel CPUs with HyperThreading.
Fixed: Selecting the entire image and then using Zoom to Selection or the Zoom Tool would align the image in an awkward manner
Fixed: In rare cases, Settings -> Plugin Errors was hanging the whole system (bug in WPF?). This UI is now implemented in WinForms instead of WPF.
Fixed: Some more high-DPI issues, especially when using multiple monitors with mixed DPI, or when using Remote Desktop

Minimum System Requirements
• Windows 7 SP1 or newer (including Windows 8, 8.1, and 10)
• 1GHz processor (dual-core recommended)
• 1GB of RAM

Paint.NET depends on Microsoft's .NET Framework 4.6, which is automatically installed if it isn't already on the system.
Paint.NET will automatically run in 64-bit mode if possible. You must have a 64-bit capable CPU and an x64 edition of Windows.
Paint.NET does not work on Windows RT.
Paint.NET uses your hard drive to store temporary files related to undo/redo history. Because of this, actual disk space requirements will depend on the actions you perform on an image, and on the size of the image.