Top 20 NuGet filedb Packages

PCL Extension provides a database implementation for .NET, Xamarin.iOS, Xamarin.Android. This makes it easier to create cross-platform .NET libraries and apps.
File provider for Entity Framework Core (to be used for development purposes)
FileContext is a data access layer (DAL) Framework for rapid data driven application development (RDDAD) append to EntityFramework.
FileContext.MongoDb is a data access layer (DAL) Framework for rapid data driven application development (RDDAD) (MongoDb Store Provider).
Ready to go LiteDB Module, Unique Authority Registration, Authority Login
FileDb is a free to use simple NoSQL database Portable Class Library for .NET - Stores one table per file, including its index - Extremely small size DLL - Supports field types Int, UInt, Bool, String, Byte, Float, Double and DateTime and also arrays of the same types - Index supports a single Prim...
Local database for .NET
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.