I'm not sure if the copy on your landing page reflects your overall marketing strategy, but in my experience, most agents are less interested in products that solve pain points (eg, complex website setup processes), and more interested in products that give them an edge, highlight their personal brand, etc. I've learned a lot about this topic from reading industry news, like 'Inman Select'
Of course I don't mean to suggest that a traction problem can be solved solely with adjustments to copy, but branding, etc, is the lingua franca of the agent community, so even slight miscalibrations could significantly affect adoption.
As to the open sourcing, I personally wouldn't, at least not in a fashion that requires lots of your effort to upkeep. The market is so competitive, I have trouble imagining adoption of an open source kit would be wide enough to justify your effort /sacrificing your IP.
What about other distribution channels? There are a number of sites that act as realtor back-end DBs/CMS. Is it feasible to partner with one of those and serve as the official Wysiwyg of such-and-such MLS/Database?
Would love to learn more about your experiences here, btw, if you're up for a chat--brandon@wayhome.io. It's a difficult and fickle market to serve, so I empathize.