Color Calculator
Generate color palettes based on harnomy
Free
Web
Alternatives to Adobe Color
3 tools researchers use instead of Adobe Color: 2 free. Open-source and free tools come first.
Paletton
Generate color palettes
Free
Web
Coolors
Nice tool to select color palette/theme for figure plotting and/or design
Free plan
Web
Prices and licences change, so check each tool's site. Missing one? Suggest a tool.