Colour is an important part of the overall web site design and online colour tools can save web designers a lot of time. Here is a list of the top 10 colour tools I use when working with Mambo templates (and non-Mambo templates too!)
Recommended Online Colour Tools
Then once you have chosen your colours, you can analyse the contrast between the foreground and background colours with this nifty tool:
Colour Contrast Checker
Vischeck
Computer simulation of colour blindness - check if your colour scheme will work for all visitors.
Learning Colour
Convert RGB colours to Hexadecimal
RGB to Hex Value Calculator
Inspiration
Administrator Tips
Performance
Search Engine Optimisation
Security Tips
Talk Mambo
Templates
User Tutorials