GrowthHackList - 100+ curated growth hacks for makers + early stage startups
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
Your Growth Hacks Aren't Working - Free new book by Steli Efti on B2B customer acquisition
Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
GrowthHackingIdea.com - One short, curated growth hacking idea a day to your email
HelpScout - Help Scout is a simple, straightforward way to provide excellent support