A curated collection of awesome LINQ libraries, tools, and more. The goal is to build a categorized community-driven collection of very well-known resources.
Inspired by awesome-dotnet, awesome-regex and the whole awesome-* trend on GitHub.
Sharing, suggestions and contributions are always welcome! Please take a look at the contribution guidelines and quality standard first. Thanks to all contributors, you're awesome and wouldn't be possible without you!
- LINQ to Bing - LINQ provider for Bing search API engine
 - LINQ to CSV - Popular, easy to use library to read and write CSV files (by @mperdeck)
 - LINQ to DB - Linq to database provider (by @linq2db)
 - LINQ to Excel - Retrieve data from spreadsheets by using LINQ (by @paulyoder)
 - LINQ to Google - Query Google's Data Sources using a strongly typed syntax
 - LINQ to JSON - Part of the lib Newtonsoft.Json.NET (by @JamesNK)
 - LINQ to REST - Parses OData system query parameters to create a LINQ query
 - LINQ to SharePoint - Query SharePoint lists using familiar LINQ syntax
 - LINQ to Twitter - LINQ Provider for the Twitter API (by @JoeMayo)
 - LINQ to Wiki - .Net library to access MediaWiki API (by @svick)
 - LINQ to XSD - LINQ to XSD enhances the existing LINQ to XML technology
 
- ExtraLINQ - Extension methods for various .NET sequence types (by @mariusschulz)
 - i4o (index for objects) - Indexed LINQ - Extends LINQ to allow you to put indexes on your objects
 - LINQKit - Extensions for LINQ to SQL and Entity Framework power users (by @scottksmith95)
 - LINQ Extensions - LINQ extensions for .NET is a collection of useful extensions methods that extends LINQ's capability. There are methods for combinatorics, mathematical sequences and others Array/IEnumerable extensions. (by @TommasoScalici)
 - LINQ Extensions Library - Statistical analysis, sequence generation and manipulation, pattern detection and more
 - Mono.Linq.Expressions - Complement for System.Linq.Expressions (by @jbevain)
 - MoreLINQ - Extensions to LINQ to Objects (by @morelinq)
 - Linq.Extras - Extensions to LINQ to Objects, and utilities to manipulate lists and comparers (by @thomaslevesque)
 
- RavenDB - A linq enabled document database for .NET (by @ravendb)
 
- L2ST4 – T4 based code generation to replace the default code generated from the DBML file with LINQ to SQL
 - LINQ IQueryable Toolkit - Build your own LINQ provider written by the mind behind LINQ to SQL
 - ReLinq - Create full-featured LINQ providers. ReLinq is used by EF 7 and NHibernate
 - LINQBridge - Complete re-implementation of LINQ to Objects for projects targeting Microsoft .NET Framework 2.0
 
- LINQPad - An awesome tool to test and prototype LINQ queries.
 - Linqer - Convert SQL query to LINQ
 - LINQ to Entity query visualizer - View Native SQL of LINQ to entities ObjectQuery in Visual Studio
 
- 101 LINQ Samples - Sample covering all LINQ functionality and demonstrating LINQ with SQL, DataSets, and XML
 - LINQ - Sample Queries - This project contains about 101 samples using LINQ
 
- 10 LINQ Myths - Ten root causes of the most common misunderstandings
 - SQL queries in LINQ
 - The 6 best practices for writing LINQ extension methods (by @kbilsted)
 - Why LINQ beats SQL
 
- LINQ for Beginners - Let's see some examples, and explore what LINQ does for us (by @exceptionnotfound)
 - LINQ: Test-Driven Learning - Help the user further study LINQ with a test-driven approach (by @MartinChavez)
 
- LINQ Quiz - Take the following short quiz and test your knowledge of LINQ!
 
- CLinq - LINQ support for the C++/CLI language
 - go-linq - .NET LINQ-like query methods for Go (by @ahmetalpbalkan)
 - hxLINQ - An implementation of LINQ in Haxe (by @andyli)
 - Jinq - LINQ-style queries for Java 8 (by @my2iu)
 - LINQ in JavaScript - Use ES6 iterators for proper lazy evaluation (by @aaronpowell)
 - Linq - LINQ for list comprehension in C++ (by @pfultz2)
 - Linq - Objective-C implementation of LINQ (by @RyujiSamejima)
 - LinqToObjectiveC - Brings a Linq-style fluent query API to Objective-C (by @ColinEberhardt)
 - linq - PHP implementation of LINQ 2 Objects (by @fusonic)
 - linq - LINQ support for Go (by @zx48)
 - linqts - LINQ for TypeScript (by @kutyel)
 - linq.js - LINQ for JavaScript library packaged for node.js (by @mihaifm)
 - linq4j - A port of LINQ (Language-Integrated Query) to Java (by @julianhyde)
 - node-linq - LINQ for node (by @contra)
 - SINQ - LINQ for Swift - Swift Integrated Query (by @slazyk)
 - Pinq - PHP Integrated Query, a real LINQ library for PHP (by @TimeToogo)
 - YaLinqo - Yet Another LINQ to Objects for PHP (by @Athari)
 
You may want to look to awesome-dotnet by @Quozd, awesome-dotnet by @Valien or awesome-test-automation (C# section) by @atinfo. Also .NET libraries that make your life easier by @tallesl deserves a mention.
Other amazingly awesome lists can be found in the awesome-awesomeness list, the awesome list or if you want more lists.