Go to meetups, tech events, conferences, etc. Just get out there and make friends with the type of people who you think can help you accomplish your vision.
We've been building Everwealth (https://www.everwealth.io/) and, since a lot of developers seem to be using our product, we want to learn what features dev's a technical audience want most. We'd love your ideas.
LeadBoxer would be a great tool to add to this list. It makes it so that forms become shorter, but have even more information about leads than before: https://www.leadboxer.com/
It's not my product, but I think it's slightly less simple than Mint; making it more powerful. Saying it's less simple might sound like a deterrent, but it should be thought of as a huge advantage, especially on the budgeting side. It's easier to create budgets that are easy to follow and make necessary changes to your budget as unexpected expenses pop up.
I'm also a huge fan of the insights/data. I think Everwealth has done a great job displaying data in a way that makes it easy to identify patterns and trends in your spending.
No spam here... we don't even send a thank you email when you join the site. We're about to be live in a week or so, and are just creating our pre-launch list. If you have no interest, simply don't opt-in for more info :)
I think Slack built a stronger brand by being obsessed with user feedback. This feedback helped make it fun, and not corporate. For example, look at the HipChat homepage versus Slack homepage. Which looks more enjoyable to use?...
It's also interesting to note that Google is making a large investment in New TLDs: http://www.google.com/registry/ -- In addition to owning a lot TLDs, they just paid $25 million for the rights to .app.