I've built a Vue component library based on the GOV.UK Design System, which is used for government services in the UK. The Design System is well-known for being accessible, well designed and thoroughly researched, and it's been used as the basis for many other governments' and organisations' design systems.

GOV.UK Vue includes every component in the GOV.UK Design System, with comprehensive docs. It can also be used for projects that aren't related to GOV.UK, as long as they don't use the GOV.UK branding