The best alternatives to Vacuum Data are API List, Open Data Inception, and OpenStreetMap. If these 3 options don't work for you, we've listed a few more alternatives below.
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Open Data Inception is a list of more than 2,700 data portals available around the world. It exists as a map, a list and an API. opendatainception.io is built w/ Bootstrap and open source widgets connecting a source dataset to the map through an API. You can search, filter, and find your local portals in minutes.
OpenStreetMap is a collaborative project to create a free editable map of the world. The geodata underlying the map is considered the primary output of the project.