Top 20 NuGet nosql Packages

RiakClient NetStandard - NOT affiliated with Basho.
MongoDB Repository
Simple and powerful SQL builder
C# Redis Client for the worlds fastest distributed NoSQL datastore. Byte[], String and POCO Typed clients. Thread-Safe Basic and Pooled client managers included.
A fork of the Couchbase Lite 1.4 (https://github.com/couchbase/couchbase-lite-net) modified for use with Xamarin and PredixSDK
A .NET core 2.2 fork of CSRedis.
A portable NoSql database for .NET applications with a single table per file. The field types are native CLR types, and arrays of the same, eg: Int32, Boolean, Byte[]. Multiple databases can be joined using LINQ.
A simpler way to use LiteDB.
Provides an API for working with MarkLogic Data Services.
A CLI tool for supporting projects using the MarkLogic .NET Client Library.
.NET Standard 2.0 version of ServiceStack.Redis
Geev.MongoDB
db4o is an .NET embedded object oriented database aimed to simplify object storage / query / retrieval with minimal. this is GPL .netstandard2.0 version