Web & mobile
http://foundation.zurb.com/
http://bulma.io/
https://getuikit.com/
http://materializecss.com/
https://getmdl.io/index.html
https://material.io/
https://ant.design/
Vuejs Ready
https://getuikit.com/
https://vuetifyjs.com/
https://element-plus.org
Vuejs Native
https://nativescript-vue.org/ # NativeScripts builds only binary apps
http://quasar-framework.org/ # Builds everywhere (even desktop) but seems web UI
https://github.com/quasarframework/quasar-awesome
Bootstrap themes
https://www.creative-tim.com/
App-like
http://framework7.io/
https://developer.apple.com/ios/human-interface-guidelines/overview/design-principles/
Headless
http://vuefront.com
https://www.vuestorefront.io
https://www.storyblok.com