[tarunupaday]

I do not know which one was/is the most successful.

In terms of real-world use cases - I am familiar with and excited about WindingTree. https://windingtree.com/

They are building a platform to make the distribution of travel products (hotel rooms, flights and more) - arguably digital tokens with real-world value - more inclusive.

They did an ICO with a token called LIF that I bought at that time (not to dump later, but because I could identify with the problem and wanted to support them)