Hacktoberfest is a month-long celebration of open source software in partnership with Github .

A repository for beginners to create their first Pull Request.

All of your suggestions are welcome!!

You can add references to some cool open source projects below:

Zulip is 100% open source software, built by a vibrant community of hundreds of developers from all around the world.

Developing Open Source Software and Hardware to improve people's lives.

This technology could fall into the right hands. Mozilla has 30 repositories available. Follow their code on GitHub.

Learn to code for free with millions of other people round the world.

List of Data Structures and Algorithms

App that lets users gamify real-life choices and activity with in-app rewards .

Learn to code for free with millions of other people around the world.

A declarative, efficient, and flexible JavaScript library for building user interfaces. Plenty resource to learn. (official)

Build cross-platform desktop apps with JavaScript, HTML, and CSS. Plenty Resource to learn and contribute. (official)

A tribute and log of beloved products and services killed by Google. This is a fun open source project that encourages contributors for Hacktoberfest!

A website which helps you find projects/issues based on your required language or issue labels.

Another useful tool for searching issues to fix

List of projects with issues that can be resolved by beginners

A list of issues that are labelled “first-timers-only”.

A list of awesome beginners-friendly projects.

A tribute and log of beloved products and services killed by Google. This is a fun open source project that encourages contributors for Hacktoberfest!

TensorFlow is an open-source software library for dataflow programming across a range of tasks. It is a symbolic math library, and is also used for machine learning applications such as neural networks.

An open source container system for automating deployment , scaling and management of containers application.

DuckDuckGo is a privacy-conscious search engine that doesn't track users. Instant Answers is a feature that provides answers without needing to open up a website..

An open-source JavaScript library for creating web components which are then used to build web pages and apps, Polymer is currently being developed by Google developers and contributors on GitHub. Central to a wide range of Google services and websites, including YouTube, Google Earth and Google Sites, Polymer received an update in January (Polymer 2.4) which is paving the way for 3.0 and TypeScript support.

Blender is the free and open source 3D creation suite. It supports the entirety of the 3D pipeline—modeling, rigging, animation, simulation, rendering, compositing and motion tracking, even video editing and game creation.

SageMath is a computer algebra system with features covering many aspects of mathematics, including algebra, combinatorics, graph theory, numerical analysis, number theory, calculus and statistics. It builds on top of many existing open-source packages: NumPy, SciPy, matplotlib, Sympy, Maxima, GAP, FLINT, R and many more.

Material Ocean is a theme for various Applications based on a blueish ocean color scheme

A starter project for Ruby On Sinatra web app projects to introduce programmers to Ruby programming. Link to Live Application HERE