Geodata plugin
The Geodata plugin allows you to add a data source that creates objects for countries, cities, and currencies which can be used in data streams that come from other data sources.
It's a utility plugin that can add data sources without entering any credentials, which means you don't have to create an API key, user account, or anything like that.
The OpenWeatherMap data source is a great addition to the Geodata data source. It enables you to see weather data for the cities and countries the Geodata data source created. See OpenWeatherMap plugin.