I love MyPaint -- a nice and easy tool for painting, with wonderful support for Wacom tablets.

On the site, it is described as:

a fast and easy open-source graphics application for digital painters. It lets you focus on the art instead of the program. You work on your canvas with minimum distractions, bringing up the interface only when you need it.

It has LOTS of nice brushes, a distraction-free interface, and, I think, a clear button.

Downside: It is more painting-orientated, and doesn't have things like circle, so it might not fit your requirements.

I love MyPaint -- a nice and easy tool for painting, with wonderful support for Wacom tablets.

On the site, it is described as:

a fast and easy open-source graphics application for digital painters. It lets you focus on the art instead of the program. You work on your canvas with minimum distractions, bringing up the interface only when you need it.

It has LOTS of nice brushes, a distraction-free interface, and, I think, a clear button.

Downside: It is more painting-orientated, and doesn't have things like circle, so it might not fit your requirements.

I love MyPaint -- a nice and easy tool for painting, with wonderful support for Wacom tablets.

On the site it is described as:

a fast and easy open-source graphics application for digital painters. It lets you focus on the art instead of the program. You work on your canvas with minimum distractions, bringing up the interface only when you need it.

It has LOTS of nice brushes, a distraction-free interface, and, I think, a clear button.

Downside: It is more painting-orientated, and doesn't have things like circle, so it might not fit your requirements.

I love MyPaint -- a nice and easy tool for painting, with wonderful support for Wacom tablets.

On the site, it is described as:

a fast and easy open-source graphics application for digital painters. It lets you focus on the art instead of the program. You work on your canvas with minimum distractions, bringing up the interface only when you need it.

It has LOTS of nice brushes, a distraction-free interface, and, I think, a clear button.

Downside: It is more painting-orientated, and doesn't have things like circle, so it might not fit your requirements.