i am searching for public available datasets from projects, in which the blockchain technology would be "useful". For example projects like supply chainys or trading (e.g. in the energy market). I couldn't find anything, but maybe somone here knows more?
You can take a look at stateofthedapps.com which lists and categorises most of the Blockchain projects in the Ethereum space and more.
The curated list of decentralized applications. Explore decentralized applications (apps built on Blockchain). Discover the possibilities of the Ethereum, EOS & POA blockchain with the definitive registry of ÐApp projects.