These are my favorite apps for color inspiration and palettes for projects:
Coolors: Generate a palette of five swatches randomly or by locking in your favorite hues.
Paletton: Easily grab monochromatic, adjacent, tertiary, and triad values as based on the color wheel.
Flat UI Colors: I've used in a few web design projects to get a nice color scheme without thinking.
Also, now that I've made my own color app, I have a lot of respect for how well-executed these are!