A recommender system or a recommendation system (sometimes replacing "system" with a synonym such as platform or engine) is a subclass of information filtering system that seeks to predict the "rating" or "preference" a user would give to an item.
Sometimes ago Kaggle launched a very interesting pair of image recognition challenge for landmarks. This challenge has a large dataset of landmark images.
The term ETA here refers to the Estimated Completion Time of a computational process in general. In particular, this problem is specific to estimating completion time a batch of long scripts running parallel to each other.