It should be open source and having more feature than mongodb.
What features, specifically? I think needing to offer a superset of MongoDB rules out some of the DBs you mentioned. But some of them (like neo4j) are so different that I have a hard time seeing how they could replace MongoDB without major rework.
If you search for "mongodb vs. cassandra" and similar phrases you'll find lots of information about how they stack up against one another. The requirements you mentioned are so broad that lots of DBs will satisfy them. But I note that they don't touch on functional requirements so much as on pragmatic requirements - important as well, but normally subservient to function.
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