Data.gov
NOAA - https://www.ncdc.noaa.gov/cdo-web/
    atmospheric, ocean
Bureau of Labor Statistics - https://www.bls.gov/data/
    employment, inflation
US Census Data - https://www.census.gov/data.html
    demographics, income, geo, time series
Bureau of Economic Analysis - http://www.bea.gov/data/gdp/gross-domestic-product
    GDP, corporate profits, savings rates
Federal Reserve - https://fred.stlouisfed.org/
    curency, interest rates, payroll
Quandl -  https://www.quandl.com/
    financial and economic 

Data.gov.uk
UK Dataservice - https://www.ukdataservice.ac.uk
    Census data and much more
WorldBank - https://datacatalog.worldbank.org
    census, demographics, geographic, health, income, GDP
IMF - https://www.imf.org/en/Data
    economic, currency, finance, commodities, time series
OpenData.go.ke
    Kenya govt data on agriculture, education, water, health, finance, …
https://data.world/
Open Data for Africa - http://dataportal.opendataforafrica.org/
    agriculture, energy, environment, industry, …
Kaggle - https://www.kaggle.com/datasets
    A huge variety of different datasets
Amazon Reviews - https://snap.stanford.edu/data/web-Amazon.html
    35M product reviews from 6.6M users
GroupLens - https://grouplens.org/datasets/movielens/
    20M movie ratings
Yelp Reviews - https://www.yelp.com/dataset
    6.7M reviews, pictures, businesses
IMDB Reviews - http://ai.stanford.edu/~amaas/data/sentiment/
    25k Movie reviews
Twitter Sentiment 140 - http://help.sentiment140.com/for-students/
    160k Tweets
Airbnb - http://insideairbnb.com/get-the-data.html
    A TON of data by geo
UCI ML Datasets - http://mlr.cs.umass.edu/ml/
    iris, wine, abalone, heart disease, poker hands, ….
Enron Email dataset - http://www.cs.cmu.edu/~enron/
    500k emails from 150 people
    From 2001 energy scandal. See the movie: The Smartest Guys in the Room.
Spambase - https://archive.ics.uci.edu/ml/datasets/Spambase
    Emails
Jeopardy Questions - https://www.reddit.com/r/datasets/comments/1uyd0t/200000_jeopardy_questions_in_a_json_file/
    200k Questions and answers in json
Gutenberg Ebooks - http://www.gutenberg.org/wiki/Gutenberg:Offline_Catalogs
    Large collection of books
    
IMAGES
ImageNet - http://image-net.org
    14M images of objects
Google - https://ai.googleblog.com/2016/09/introducing-open-images-dataset.html
    9M image URLs with labels
Microsoft Coco - http://cocodataset.org
    330k images, most labeled
Labelled Faces in the Wild - http://vis-www.cs.umass.edu/lfw/
    13k face images with names
Stanford Dogs - http://vision.stanford.edu/aditya86/ImageNetDogs/
    120 dog breeds, 20k images

AUTONOMOUS CARS
Berkeley DeepDrive - https://bdd-data.berkeley.edu/
    Massive dataset including 100k videos with 1100 hours of hd driving
Belgian Traffic Signs - http://www.vision.ee.ethz.ch/~timofter/traffic_signs/
    10k images
Bosch Small Traffic Signals - https://hci.iwr.uni-heidelberg.de/node/6132
    5k training and 8k test images
WPI Traffic Light, Pedestrian, Lane-Keeping - http://computing.wpi.edu/dataset.html
    30GB of training and test data from Worcester, Mass
UCSD Lisa - http://cvrr.ucsd.edu/LISA/datasets.html
    Vehicle detection, traffic signals
