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You can also checkout http://db-engines.com/en/ranking/graph+dbms which gives a ranking of various technologies (graph, document, search).

Are there (NoSQL-)DBs that don't use foreign-keys for one-to-many and store the related "child" keys in the "parent" record as array?

It seems only client-side frameworks use this storage scheme for relations. DBs always use foreign keys (even such as rethinkDB). This always gets me a tiny mismatch between client and server.

I wrote a book on it too, https://leanpub.com/NewDataAFieldGuide.

It mentions ArangoDB twice. Once in the Document Store and once in the Graph sections.