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https://datasets.reddit.com https://datasets.reddit.com https://opendata.reddit.com https://opendata.reddit.com https://archive.ics.uci.edu/ml/datasets.php https://archive.ics.uci.edu/ml/datasets.php https://lod-cloud.net/ https://lod-cloud.net/ https://www.data.gov https://www.data.gov https://data.un.org/ https://data.un.org/ https://data.worldbank.org/ https://data.worldbank.org/ https://fred.stlouisfed.org/ https://fred.stlouisfed.org/ https://data.oecd.org/ https://data.oecd.org/ https://www.nber.org/research/data?page=1&perPage=50 https://www.nber.org/research/data?page=1&perPage=50 https://github.com/awesomedata/awesome-public-datasets https://github.com/awesomedata/awesome-public-datasets https://github.com/datasets https://github.com/datasets https://opendata.cern.ch/ https://opendata.cern.ch/ https://data.nasa.gov/ https://data.nasa.gov/ https://data.world/datasets/machine-learning https://data.world/datasets/machine-learning https://data.noaa.gov/datasetsearch/ https://data.noaa.gov/datasetsearch/ https://www.usgs.gov/products/data https://www.usgs.gov/products/data https://www.fema.gov/about/openfema/data-sets https://www.fema.gov/about/openfema/data-sets etc... And of course don't ignore the data you can collect yourself one way or another. A few cheap Arduino Nano or Rpi Pico boards, some sensors, and you can build quite a variety of distributed data collection systems. Use solar panels for power in remote areas, and 4G / cellular data networks and you can get data from all over the place. You can also use a cheap SDR "dongle" to pull down data from various weather satellites and other sources. And don't forget about the API's / data export mechanisms for apps you might use like Fitbit, Strava, MapMyRun, etc.