Top Tools That Integrate With HubSpot

We're updating an article that identifies tools that inbound marketers find irreplaceable. Specifically, we are looking for tools that integrate with HubSpot and are complementary to HubSpot's features.
 
Note: If you have filled out another survey about tools, please do not repeat the same answer.

The article will be published at www.databox.com/blog We will include a link to your site (enter it below). We have 25k subscribers and a Moz domain authority of 42. 
 
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1.Email Address?(Required.)
2.Your Name?(Required.)
3.Your Company Name?(Required.)
4.What's your favorite tool that integrates with HubSpot?(Required.)
5.What is the stand-alone value of this tool? What does this tool do? (Required.)
6.How does the tool integrate with HubSpot? What is the value of integrating this tool with HubSpot?(Required.)
7.Your company's URL/website address (If you've written an article about this tool, include that instead).(Required.)