A list of design systems and design resources that gov departments have created. I'm more focussed on design guidance, rather than front end developer code resources but there is some cross over (there's a great list by @nickcolley you should check out for that https://github.com/nickcolley/awesome-govuk-frontend)
- GOV.UK Design System: https://design-system.service.gov.uk
- Backlog and community discussion: https://github.com/alphagov/govuk-design-system-backlog/projects/1
- Digital Marketplace frontend toolkit: https://alphagov.github.io/digitalmarketplace-frontend-toolkit/
- GOV.UK Publishing guide: https://docs.publishing.service.gov.uk/manual/components.html#component-guides
- Home Office Design System: https://home-office-digital-patterns.herokuapp.com/
- Backlog and community discussion: https://github.com/UKHomeOffice/design-system/projects/1
- Home Office Form builder: https://ukhomeofficeforms.github.io/hof-guide/
- DWP Design Examples: https://dwp-design-examples.herokuapp.com/
- Backlog and community discussion: https://github.com/dwp/design-examples/projects/1
- HMRC Design patterns: https://hmrc.github.io/assets-frontend/
- Backlog and community discussion: https://github.com/hmrc/design-patterns/projects/1
- MOJ Design patterns: https://moj-pattern-library.herokuapp.com/
- CJS Crime programme design patterns: https://cjscpp-design-patterns.herokuapp.com/
- HMCTS Design System: https://hmcts-design-system.herokuapp.com/
- Design elements: http://land-registry-elements.herokuapp.com/
- RPA Styleguide: https://rural-payments-styleguide.herokuapp.com/
- Form builder (lets you create a form transaction visually): https://github.com/DEFRA/digital-form-builder
- NHS Design Patterns: https://beta.nhs.uk/service-manual/patterns/
- ONS website pattern library: https://onsdigital.github.io/ons-pattern-library-starter/
- MyGov.Scot resources:https://scottishgovernment.github.io/design-standards/
- DTA Design System: https://designsystem.gov.au/
- US Web Design System: https://designsystem.digital.gov/