twurl - OAuth-enabled curl for the Twitter API

•    Ruby

OAuth-enabled curl for the Twitter API

Twitter4j - Twitter Java Library

•    Java

Twitter4J is an open-sourced, mavenized and Google App Engine safe Java library for the Twitter API which is released under the APL 2.0.

twitteroauth - The most popular PHP library for use with the Twitter OAuth REST API.

•    PHP

The most popular PHP library for Twitter's OAuth REST API. See documentation at https://twitteroauth.com.

codebird-php - Easy access to the Twitter REST API, Direct Messages API, Account Activity API, TON (Object Nest) API and Twitter Ads API — all from one PHP library

•    PHP

Easy access to the Twitter REST API, Direct Messages API, Account Activity API, TON (Object Nest) API and Twitter Ads API — all from one PHP library. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

codebird-php - Easy access to the Twitter REST API, Direct Messages API, Account Activity API, TON (Object Nest) API and Twitter Ads API — all from one PHP library

•    PHP

Easy access to the Twitter REST API, Direct Messages API, Account Activity API, TON (Object Nest) API and Twitter Ads API — all from one PHP library. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

talon-for-twitter-android - The Material Design version of my popular Android Talon for Twitter app, 100% open-source

•    Java

This is the complete version of the Twitter client that I created for Android. It is 100% open source, the only thing that you will have to do plug in is your own API keys. I am lucky enough to say that, as a paid app, Talon has perched itself at the top of the top paid social apps list since it's release in 2014. It has amassed 100,000+ downloads while holding a 4.6 star rating on the Play Store. This app is one of the more successful apps I have ever made and I am open sourcing it as a "thank you" to everyone that has supported my work over the years! It works great and I'm proud to say that it can probably be considered one of the most popular third party Twitter apps.

twitter-lite - A tiny, full-featured, flexible client / server library for the Twitter API

•    Javascript

A tiny, full-featured, modern client / server library for the Twitter API. We have built this library because existing ones have not been recently maintained, or depend on outdated libraries.

LINQ to Twitter

•    LINQ

Linq2Twitter is an open source LINQ Provider for the Twitter micro-blogging service. It covers the entire Twitter API and supports multiple .NET technologies.

Hosebird client - A Java HTTP client for consuming Twitter's Streaming API

•    Java

A Java HTTP client for consuming Twitter's Streaming API. It has GZip support, OAuth support, Partitioning support, Automatic reconnections with appropriate backfill counts, Access to raw bytes payload, Proper backoffs/retry schemes, Relevant statistics/events, Control stream support for sitestreams.

GNU Social - Microblogging, Alternative to Twitter

•    PHP

GNU social is a free social networking platform and it is a continuation of the StatusNet project. It helps people in a community, company or group to exchange short status updates, do polls, announce events, or other social activities (and you can add more!). Users can choose which people to "follow" and receive only their friends' or colleagues' status messages. It provides a similar service to proprietary social network sites, but is much more awesome.

tweetinvi - Tweetinvi, an intuitive Twitter C# library for the REST and Stream API

•    CSharp

Tweetinvi is an intuitive .NET C# library to access the Twitter REST API. It is a .NETCore and Portable Class Library that can be used for development on Windows, Windows RT, Windows Phone, Mono, Xamarin Android and Xamarin iOS. Tweetinvi is also compatible for Universal App development. Tweetinvi is developed for free. All donations are greatly appreciated.

harpy - A Twitter app built with Flutter

•    Dart

Harpy is currently still in development. See the project for more information about the progress. Harpy is a fully featured Twitter client that focuses on great UI/UX and a clean experience.

Twython - Python library providing an easy way to access Twitter data

•    Python

Twython is a Python library providing an easy way to access Twitter data. It supports both normal and streaming Twitter APIs.

twitter-php - Small and easy PHP library for sending messages to Twitter and receiving statuses.

•    PHP

Twitter for PHP is a very small and easy-to-use library for sending messages to Twitter and receiving status updates. Sign in to the https://twitter.com and register an application from the https://apps.twitter.com page. Remember to never reveal your consumer secrets. Click on My Access Token link from the sidebar and retrieve your own access token. Now you have consumer key, consumer secret, access token and access token secret.

codebird-js - A Twitter library in JavaScript.

•    Javascript

A Twitter library in JavaScript. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

TwiXaml

•    CSharp

a twitter client built with WPF Note: now supports oAuth.

Silvertweet

•    CSharp

The new "Hello, World!". A simple Silverlight application which connects to Twitter and displays the most recent status update from a public timeline.

WeatherTweet

•    DotNet

Allows you to get the weather via a specified Postal Code. It then tweets it on your account. Tweets the current conditions, the forecast and also gives you the information on your desktop. Uses the Yahoo Weather API as well.

OAuth Utility

•    CSharp

This application helps you to retrieve an access token and secret token for OAuth authentication.

Twitter Authentication Provider for DotNetNuke®

The Twitter Authentication Provider for DotNetNuke® can be installed on DNN4.x or DNN 5.x and allows users to link their twitter account to your portal instance, providing another method for users to securely authenticate on your website.