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    * [elephantsql.com](http://www.elephantsql.com/) — PostgreSQL as a service, 20 MB free
    * [graphenedb.com](http://www.graphenedb.com/) — Neo4j as a service, up to 1,000 nodes and 10,000 relations free
    * [mlab.com](https://mlab.com/) — MongoDB as a service, 500 MB free
+   * [MongoDB Atlas](https://www.mongodb.com/cloud/atlas) — free tier gives 512 MB
    * [scalingo.com](https://scalingo.com/) — Primarily a PaaS but offers a 512 MB free tier of MySQL, PostgreSQL or MongoDB
    * [skyvia.com](https://skyvia.com/) — Cloud Data Platform, offers free tier and all plans are completely free while in beta
    * [airtable.com](https://airtable.com/) — Looks like a spreadsheet, but it's a relational database, unlimited bases, 1,200 rows/base and 1,000 API requests/month