Top 20 NuGet fixed Packages

Open Source library for automatic formatted file read/write operations www.filehelpers.net
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.
Open Source library for automatic formatted file read/write operations www.filehelpers.net. Unofficial .NET Standard 2.0 / .NET Core port.
Fixed Data Table (fixed-data-table) binding library for Bridge.NET projects.
Fixed Data Table 2 (fixed-data-table-2) binding library for Bridge.NET projects.
FlatFile is fast-working open-source library for reading/writing plain files
FlatFile.FixedLength is fast-working open-source library for reading/writing fixed-length plain files
Core library for FlatFile.[name].Attributes assemblies
Core library for FlatFile assemblies
A .NET port of BeanIO which perfectly fits into the .NET world.
Readers and writers for CSV and fixed-length file formats. Supports both synchronous and asynchronous operation, data annotations, and wicked fast object serialization.
A mobile-first CSS framework that supports responsive mobile first and fixed desktop layouts.
Readers and writers for CSV and fixed-length file formats. Supports both synchronous and asynchronous operation, data annotations, and wicked fast object serialization.
a fixed size high performant in memory cache
Serialize and Deserialze .Net objects to Fixed Width Strings
a simple C# project for reading and writing fixed-width files with headers and footers.
Fielded Text Implementation (reader, writer, and meta creator/loader/saver). See http://www.fieldedtext.org for more information about Fielded Text.
Use FlatFiles to generate MVC ActionResults.
Library for reading and writing CSV and Fixed Width files into a class or struct similar to XmlSerializer.
Read flat files using the ADO.NET IDataReader interface. This project has been retired and replaced with FlatFiles, which is easier to use, supports more file formats and is extremely fast!