1. Social & Display ads.
2. Viral marketing.
3. Public relationship.
4. Unconventional PR.
5. Search Engine Marketing.
6. Offline advertising.
7. SEO.
8. Content Marketing.
9. Mailling.
10. Engineering as marketing.
11. Influencers.
12. Partnerships.
13. Live sales.
14. Affiliation.
15. Grow on platforms.
16. Trade shows
17. Event offline.
18. Public speaking.
19. Building a community.

presented in the book Traction: How Any Startup Can Achieve Explosive Customer Growth