Adobe Photoshop Express is now available on Windows 8 and Windows RT for free! This isn't like the full version, though it does offer a good amount of basic functionality:
- Crop, straighten, rotate, and flip your photos.
- Remove red eye.
- One-touch adjustment for brightness, exposure, and shadows.
- Slider controls for exposure, contrast, clarity, vibrance, and more.
- Over 15 "eye-catching" one-touch filters.