Hands down, it's HubSpot. It's kind of ridiculous how easy and accessible they make things for inbound marketers. 

Not only do they have an amazing software system that is easy to use, they have massive libraries on how to use and apply their software in the correct ways. There is a methodology they teach with the adoption of the software that is unlike other marketing automation software. Everything you could want is included from social tools, to a content management system, to prospect monitoring, and more.

One of the things I applaud constantly is their flexibility in developing their product to become better everyday. They have all types of feedback methods from in-app product help to beta testing group to customer feedback surveys. And they listen - no other software has let the users decide what it needs to become.

BONUS: Use a Connector

I'm super impressed by IFTTT everyday. If you aren't familiar, IFTTT is a connection tool for the internet. Working in one technology and need it to be connected to another? IFTTT is your answer. I mainly use IFTTT to automate the repetitive tasks that robots could surely do for me - and it could be anything from searching through Craigslist resume postings for new marketing talent to monitoring our competitors' new YouTube videos.

Another way I use IFTTT is to automate sharing specific Twitter messages I post to a certain channel on our internal Slack - that way, I can keep my team informed about the newest marketing trends.The possibilities are virtually limitless, so make sure to browse their Recipes section for ideas of the automation you might need.