There's a wonderful, interactive playground of variable fonts up at https://v-fonts.com https://v-fonts.com. Most variable fonts let you interpolate font weight

There's a wonderful, interactive playground of variable fonts up at https://v-fonts.com https://v-fonts.com. Most variable fonts let you interpolate font weight, width, or slant, but some go much further. See for instance, http://variableemojis.com http://variableemojis.com