The ex suffix could also come from Elixir (its a common pattern in many libraries)

This and the previous comment are both correct :)

Does anyone know what license this is released under? I looked for a few minutes on the site but I didn’t find it.

What I usually do for Open Source, instead of browsing the website, check on GitHub. https://github.com/penpot/penpot

The license on GitHub is featured prominently as MPL-2.0

MPL-2

One part of the answer to that is a land value tax. That way the “vultures” won’t be able to simply sit on the property waiting for it to appreciate before selling it.

Nice ideas! Do you have any tips for software to help automate some of those analyses?

I'm currently reading a book about that topic! https://pragprog.com/titles/atcrime/your-code-as-a-crime-sce...

Since Elixir 1.6 it is possible to create custom guards with `defguard`: https://hexdocs.pm/elixir/Kernel.html#defguard/1

It's true that you can create custom guards, but they are still very limited, and they can only be made of a small list of allowed expressions [0].

[0]: https://hexdocs.pm/elixir/1.6.6/guards.html#list-of-allowed-...

There's also lerna

Very neat project! What is the business model for this project?

I thought Philadelphia was closer to a LVT?

Where do you get the UV data from?

In New Zealand there's https://niwa.co.nz/our-services/online-services/uv-and-ozone...

Our weather forecasting agencies also forecast UV exposure, it gets reported as the "UV Index"

Don't really need it, while the sun is low in the sky you're relatively safe to get a bunch of sun.