I am aware of CSS gradient generators such as Color Zilla
Do CSS rounded corner generators exist that work across many browsers?
This one has worked really well for me.
You can use CSS3Pie to replicate CSS3 support in Internet Explorer (versions 6-9)
As stated on their site:
PIE currently adds full or partial support to IE 6 through 8 for the following CSS3 features:
- multiple background images
- linear-gradient as background image
In addition, PIE adds support for border-image and linear-gradient to IE 9, which already supports the other features natively.