Linux
Use Microsoft core fonts on linux -" sudo apt-get install msttcorefonts "
How do I install and use fonts in Linux?

Web - HTML
HTML & Unicode Arrows - https://websitebuilders.com/tools/html-codes/arrows/

Web - Colors
http://www.w3schools.com/tags/ref_colorpicker.asp
Adobe Color Wheel
Paletton.com
Color Palette Generator