Based on a Google search and my own knowledge here are the agencies and consultancies, in no particular order, that I could find that either use a Service Design approach or sell Service Design services:

  1. Experientia

  2. Fond

  3. Kraftpol

  4. Reverse

  5. Reform

  6. Liip

  7. Creative Dock formerly Sparkworks

  8. Positive.design

  9. Accenture Song

  10. Telono

  11. Whitespace

  12. Sketchin

  13. Green Liff

  14. Enigma

  15. Craftt

  16. Studio Banana

  17. Brandpulse

  18. EPB

  19. Dept

  20. Valtech

  21. Creaholic

Going further

More can be found in the Service Design Map of Switzerland created by the Swiss Service Design Network