> The requirements here are kinda strange (proximity to a grocery store? not crime rates or anything like that?), but to each his own, I suppose.
You're right. I've been working with open data in the Portland area for years now [1][2][3][4] and have a lot of built up internal knowledge of the neighborhoods and locations so I chose not to muddy the map with those things.
Are you referring to real estate listings? In my case, I use Trulia to search the zones after I narrow down the locations. However, if you're referring to the building footprints I have a Make target that pulls GIS data from public sources: https://github.com/caged/portland-atlas
Thought I'd mention to you that your 'supermarkets' data is pretty out of date or marginal quality. I see at least 3-4 supermarkets opened in the last year not on there.
Most of our graphs are pretty stock d3 code tailored for specific datasets, so I don't see much value in open sourcing them. Is there anything in particular you're interested in?
There's a need for a good charting library built on top of d3. Kind of like Highcharts, in terms of usability, but free. d3 is powerful but not as easy to use and customize as Highcharts.
Can I suggest http://www.sibdo.com For individuals it's free and built on top of d3 with some extra functionality that Higcharts does't have. You can even drag files directly onto to the visualizations and the data will render. Also really nice UI for mobile.
Looking at the Sibdo pricing page, it looks like much higher pricing (compared to the more established competitors) at $95 a month for use on a SINGLE website with a confusing limitation to "50 users" whatever that means.
Not only that, the example graphs and charts look very basic.