Limeberry allows you to create custom CSS 3 gradients with high granularity. Fine-tune down to the nth decimal place.
An open source project. Defaulting to MIT license, but may change the license to one even more open.
Project Roadmap (strikethroughs are already complete):
0.1 - Ability to create horizontal css 3 color gradients with high granularity and finely detailed control. 0.2 - Add support for vertical gradients
0.3 - Overhaul UX to be more friendly
0.4 - Add a plethora of keyboard short-cuts
1.0 - Save and Load gradients. Custom URLs you can link people to so you can share your gradients
2.0 - "Widgetize" it so you can put on any web-page