Plus Codes, which are basically a transformation of latitude and longitude coordinates into a more memorable format. Like the proprietary scheme What3Words they offer better geolocation in places, such as many countries in Africa, where most buildings lack addresses.

The key dispute is whether they should be implemented on OSM and if so where: as tag/value pairs, computed on the client side, or provided by geocoders.

As a response to the recent discussion, Frederik Ramm wrote a FAQ styled blog post covering the most important points to which he added social arguments as well. Christoph Hormann and Ilya Zveryev (automatic translation) provide two different perspectives on their blogs.