Top 20 NuGet i18n Packages

Easy to use library to use Translation Memory eXchange (.tmx) files with LINQ queries
A grammatically correct, flexible alternative to String.Format and .NET resource files. Localize your MVC.NET solutions without touching code. Grammatical rules (plural forms etc.) and code is completely separated.
i18next is a very popular internationalization framework for browser or any other javascript environment (eg. node.js).
A library for handling localization files. Inspired by http://i18njs.com/.
ICU4C runtime and dev enviroment package x64 and x86
A Money class that supports ISO 4217 currency codes. Uses Banker's rounding and rounds to the precision of currency.
Finds localizable messages in *.fs and *.cs files by looking for calls such as I18n.Translate("message") in those sources. Puts unique messages into specified JSON file (updates it if neccessary). Class name, method name and other things are configurable
Translation of the text.
Localizy.AspNetCore
Localizy
Localization libarary for IGAWorks.
Yaml.I18N.Net for Xamarin iOS/Android/PCL
Component that provides class for logging and I18N.
Fluent.Net.SyntaxTest is a command line tool for checking that fluent translations files conform to the fluent syntax specification. See the Fluent.Net package for more details.
Code analyzers for Mindbox.I18n library
Strongly typed i18n (internationalization) for dot net core. This is a .net core port of afana.me's respected i18n for MVC5 (xml resources) ++. Tutorials provided.
Finds localizable messages in *.fs and *.cs files by looking for calls such as I18n.Translate("message") in those sources. Puts unique messages into specified JSON file (updates it if neccessary). Class name, method name and other things are configurable