Designing Inspired Style Guides talk by Andy Clarke at Design Exchange Nottingham.
Links from slides:
http://atomicdesign.bradfrost.com/
http://patternprimer.adactio.com/
https://britishrailmanual.com/
https://standardsmanual.com/products/nasa-graphics-standards-manual
https://standardsmanual.com/products/nyctacompactedition
https://standardsmanual.com/products/american-revolution-bicentennial-ltd
http://designguidelines.co/
http://rizzo.lonelyplanet.com/styleguide/design-elements/colours
http://ggw-prototype.goalgorilla.com/design-elements/colors.html
http://skyglobal.github.io/web-toolkit/#base-styles–colours
http://www.thetimes.co.uk/styleguide/colours
http://govuk-elements.herokuapp.com/colour/
https://material.io/guidelines/style/color.html
http://wet-boew.github.io/wet-boew-styleguide/v4/design/colour-en.html
https://issuu.com/bellfrog/docs/adobe-corporate-rand-guidelines
https://standards.usa.gov/colors/
https://www.ox.ac.uk/public-affairs/style-guide/digital-style-guide?wssl=1
http://brand.opentable.com
https://issuu.com/bondo/docs/foursquare
https://www.behance.net/gallery/2341732/STIHL-Making-It-Easy-Brand-Guidelines
https://corporateidentity.alberta.ca/downloads/Alberta_Corporate_Identity_Manual.pdf
http://www.barbican.org.uk/branding/
https://issuu.com/janjaneczek/docs/macmillanguidelinesv13fullb
http://www.mashcreative.co.uk/work/royal-mail-rethink/
https://issuu.com/amandymichiru/docs/gsm_rgb
https://issuu.com/warshajamnadas/docs/small
https://issuu.com/bondo/docs/bing_product_guidelines_copy
http://inspired.guide
https://design.atlassian.com/product/
https://gel.westpacgroup.com.au
http://www.thetimes.co.uk/styleguide/getting-started
https://www.timewarnercable.com/en/enjoy/prototypes/style-guide-prototype/styleguide.html
https://marvelapp.com/styleguide/overview/introduction
https://standardsmanual.com
http://codeforamerica.clearleft.com
https://www.mapbox.com/base/styling/icons/
https://design.atlassian.com/product/foundations/iconography/
http://govuk-elements.herokuapp.com/icons-images/
http://rizzo.lonelyplanet.com/styleguide/design-elements/destination-icons
https://britishrailmanual.com/
http://www.doublearrow.co.uk/manual.htm
https://issuu.com/bondo/docs/skype_brand_book_-_look
https://medium.com/salesforce-ux/defining-principles-to-drive-design-decisions-b647b68fb057#.9gr20dxfg
http://red-stone.com/projects/big-lottery-fund-bpr-identity