Million Songs

Task: Predict the year of a song based on characteristics of the song
Data Source: http://archive.ics.uci.edu/ml/datasets/YearPredictionMSD

Wine Quality

Task: Predict the blind taster quality score of a wine based on chemical tests
Data Source: http://archive.ics.uci.edu/ml/datasets/Wine+Quality

Leaves

Task: Identify clusters in leaf measurements
Data Source: http://archive.ics.uci.edu/ml/datasets/Leaf

House Votes

Task: Identify clusters in the Congressional Voting Records
Data Source: http://archive.ics.uci.edu/ml/datasets/Congressional+Voting+Records

Mushrooms

Task: Classify mushrooms as poisonous or edible based on their physical attributes
Data Source: https://archive.ics.uci.edu/ml/datasets/Mushroom

Letters

Task: Classify an image of a letter to one of the 26 capital letters in the English alphabet
Data Source: http://archive.ics.uci.edu/ml/datasets/Letter+Recognition