I would recommend Parse. It&#x27;s open source and used in production by thousands of companies.
<a href="https:&#x2F;&#x2F;github.com&#x2F;ParsePlatform&#x2F;parse-server" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;ParsePlatform&#x2F;parse-server</a>