What are the best free resources for startups?

Products, tools, guides, etc... I'd love to hear what people consider the best free resources that they are using at their company!
Hiten ShahCrazy Egg, KISSmetrics & Quick Sprout · Asked
Zack MillerHost of fintech podcast, Tearsheet.co · Written
Great way to get started with outbound messaging to customers, influencers. Mailchimp offers a free account for up to 2k subs.
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