Top 20 NuGet flat Packages

Open Source library for automatic formatted file read/write operations www.filehelpers.net
An ETL framework for .NET
ETL Framework for .NET
JSON extension to Cinchoo ETL framework
FluentFiles is a library for reading and writing fixed-width or delimited text files.
Reads and writes CSV, fixed-length and other flat file formats with a focus on schema definition, configuration and speed. Supports mapping directly between files and classes.
An extension for the FluentFiles.FixedLength package that enables attribute-based configuration.
An extension for the FluentFiles.Delimited package that enables attribute-based configuration.
Simple JSON flat file data store
A library for reading and writing fixed-width field text files.
A library for read and writing delimited text files such as CSV, etc.
The core library for FluentFiles.*.Attributes packages.
The core library for FluentFiles. FluentFiles is a library for reading and writing fixed-width or delimited text files.
Provides additional field converters for FluentFiles.
A library to import and export data from plain text files in a Linq compatible way
An opensource library written on C#. It contains a lot of useful things.
FlatFile is fast-working open-source library for reading/writing plain files
FlatFile.Delimited.Attributes is extension for FlatFile.Delimited package for attribute-based mapping
FlatFile.FixedLength.Attributes is extension for FlatFile.FixedLength package for attribute-based mapping
Fixed Width Parser Writer for reading and writing flat data (files) with defined field position in line or file (relative height).