The “Maintained by Kaggle” badge means that Kaggle is now and will continue to actively maintain that dataset. This includes regular updates to descriptions and metadata, quicker response rates in discussion, and accurate current data from the source. Our goal is to create seamless workflows that allow everyone to do data science on Kaggle and be confident in the data they work with.
They have several data sets available from different open data projects for several cities, as well as NOAA and the World Bank. If you’re looking for data sets to play with, this is a good option.