SunlitGreen Photo Editor is a simple tool that makes it easy to carry out basic image editing tasks.
The clean interface may appeal, especially if you're an editing novice. There's just a single toolbar, and no floating palettes at all, so there's little chance of becoming confused by all the advanced options: there really aren't any.
You do get all the regular tweaks, though, so for instance you can crop, trim or rotate a photo; adjust its brightness, contrast, colour levels and saturation (either manually or automatically); sharpen or blur the shot to suit your tastes.
There's only one selection tool (a rectangle), so most of these adjustments will probably be applied to the entire image. And of course there's no support for layers. SunlitGreen Photo Editor will quickly frustrate anyone experienced at image editing, then, however if you're looking for something much simpler then it could be a good choice.