Work being done in Pune, India:

Shelter-Associates.org

And associated press article:

Slum dwellings in Pimpri Chinchwad to get digital address; survey launched to upgrade basic amenities

- Pune News - The Indian Express

Work being done in Utah, USA:

Navajo Nation homes now have a Utah address

Government of The Gambia project to introduce Plus Code addressing:

National Digital Addressing Policy

Africa Matters: The Gambia puts streets on the map (youtube.com)

News item re South Africa:

SA's informal settlements get digital addresses - ITWeb

Work being done in Brazil:

How Google used plus codes to create 14,000 new addresses in Brazil

- Google Blog

Brazil:

In the Dreams Favela, Wi-Fi and Ecommerce Promise a Better Future

- WIRED

"Digital CEO" to include favelas in e-commerce deliveries

- Neo Feed

PlusCodes on Google site:

maps.google.com/pluscodes

Book by Deidre Mask:

The Address Book