Wix: Easy to use website development tool.
Sketch: Easy to use planning/mockup tool
Basalmiq: Easy to use wireframing software for multiple platforms
Webflow: Responsive webpage design, good for comparing across platforms. Mobile first!
Adobe Color Wheel: Not just for websites but a good way to quickly come up with various color schemes. The hexadecimal values for colors can be pasted into your HTML to give your website unique colors.