What are the most important software tools (if any) you use as a product marketer?

In addition to the ones that Jeffrey included, I'd add that I pretty much live in Salesforce. This gives me the most insight into who are our customers and prospects are, what industry they come from and what is important to them. It also helps me understand what kind of conversations our sales teams are having and how product marketing can make those more productive. 

Obviously, this means that there has to be some level of team discipline to ensure that there are proper notes and accurate data in your CRM, but there's a lot to be gained if that's the case.

It depends on your industry, and the products you are working on, but here are a few that I regularly use and I would count amongst my most important:

1. Google Docs/Spreadsheets/Presentations - Google Docs has been a great place to create, share, and distribute (internally) product positioning, narratives, and other content while it's being worked on. Typically speaking, this is where most of my new content starts.
2. Wiki (Confluence) - At HubSpot, we use Confluence to share information about product releases, marketing campaigns, and virtually everything else on our internal wiki. It's a crucial asset to our product marketing team that has served us incredibly well.
3. Slack - It goes without saying that Slack has been a massive part of helping us communicate with others across the organization in an easy and scalable way. 
4. Quicktime / GIF Software - Often times we have to record short videos for prospects, customers, or anyone internal. Any GIF software or just Quicktime is naturally helpful here.
5. Photo Editing Software - I use Photoshop sparingly, but often use it to create really high fidelity screenshots of a zoomed-in part of our software. Being familiar with Photoshop and some of its basic capabilities will be really helpful.
6. HubSpot - We utilize our marketing software within our own business, so naturally any product pages or web content that I create uses our own tool.

We've actually been surveying product marketers about this, and the tools fall into a few different categories. Here are examples from each:

1. Research and analysis (e.g. UserTesting, Typeform, Heap)
2. Collaboration (G Suite, Asana, Slack)
3. Asset creation (InVision, Frame, Soapbox)
4. Launches / marketing (Hubspot, Intercom, Zoom)

There is a longer list in this post we wrote: https://www.trychameleon.com/blog/product-marketing-tools