The best alternatives to Mongoku are MongoDB, MongoLab, and HumongouS. If these 3 options don't work for you, we've listed a few more alternatives below.
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MongoDB Inc. is an American software company that develops and provides commercial support for the open source database MongoDB, a NoSQL database that stores data in JSON-like documents with flexible schemas.
Mongita is a lightweight embedded document database that implements a commonly-used subset of the MongoDB/PyMongo interface. Use it when a MongoDB installation is too much or when SQLite is not the right choice.