"I created this ever-growing list of marketing tools for startups & small businesses that I personally have used + really like and have included reasons why. I hope you find it useful :)"
https://www.dansiepen.io/best-startup-marketing-toolsFirst build a great product and then spread the word using these channels
https://github.com/trekhleb/promote-your-next-startupCompiled list of links from "Ask HN: Where can I post my startup to get beta users?"
https://github.com/mmccaff/PlacesToPostYourStartup