With the popularity of open source, there is no shortage of projects to get involved. But, with so many options available, it can be difficult to know where to start.

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To help you get started, we've compiled a list of 30 of the best open source projects across a range of languages, including Python, JavaScript, and Java.

Originally published at anythingprogramming.com

What is an Open Source Project?

An open source project is a project whose source code is freely available for anyone to use, modify, and contribute. Open source projects are typically developed in a collaborative manner, with volunteers contributing to the code.

There are many different types of open source projects, ranging from simple applications to operating systems. Some of the most popular open source projects include the Linux operating system, the Apache web server, and the MySQL database.

Open source projects are often developed by groups of individuals, rather than by companies. This allows anyone to contribute to the project, and it also makes the project more resilient to changes in the marketplace.

Why Contribute to Open Source Projects?

There are many benefits to contributing to open source projects. By collaborating with other developers, you can help make a project better while also learning from others and building up your skills. 

Open source projects provide a great opportunity to join a community of like-minded individuals who are all working together towards a common goal.

Or, it could be that you simply want to improve your skills by working on real-world projects. Whatever your reasons, contributing to open source projects is a great way to learn new skills, advance your career, and make a difference. But it might not be easy. After all, it takes a lot of time and persistence to get contributions accepted.

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How to get started with open source projects

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1. Find a project that you're interested in. It's important to work on projects that you enjoy, as this will make it more likely that you'll stick with it and see success.

2. Familiarize yourself with the project's code. Before you start making changes, it's important to understand the codebase and how it works.

3. Make small, incremental changes. Once you're familiar with the codebase and submitting them to the project maintainers for review.

4. Be patient and persistent. Not all changes will be accepted, and it can take some time to get used to the Contributor License Agreement (CLA) process. But if you're patient and persistent, you'll eventually see your contributions accepted and make a lasting impact on the project.
   Best Python Open Source Projects

Open source projects are a great way to learn Python and get involved in the community. Here are some of the best open source projects you can get involved with.

1. Django

Django is a high-level Python web framework that encourages rapid development and clean, pragmatic design. Built by experienced developers, it takes care of much of the hassle of Web development, so you can focus on writing your app without needing to reinvent the wheel. It’s free and open source.

1. Flask

Flask is a microframework for Python based on Werkzeug, Jinja 2 and good intentions. And before you ask: It's BSD licensed!

1. Pyramid

Pyramid is a small, fast, down-to-earth, open source Python web framework. It's a cross between Django and Pylons.

1. Twisted

Twisted is an open source, MIT-licensed event-driven networking engine that was created in Python.

1. Tornado

Tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed.

1. Sqlalchemy

SQLAlchemy is the Python SQL toolkit and Object Relational Mapper that gives application developers the full power and flexibility of SQL.

1. Pygments

A Python library called Pygments is used to highlight syntax.

1. Scikit-learn

Scikit-learn is an open-source integrated machine learning, data mining, and modeling library for the Python programming language. It is also one of the most popular machine learning libraries in use today.

1. TensorFlow

TensorFlow is an open-source deep learning platform by Google. It has a comprehensive, flexible ecosystem of tools, libraries, and community resources that lets researchers push the state-of-the-art in ML and developers easily build and deploy ML-powered applications.

1. Theano 

Theano is a Python library that allows you to define, optimize, and evaluate mathematical expressions involving multi-dimensional arrays efficiently. It can use GPUs and perform efficient symbolic differentiation.

1. Keras

Keras is a high-level neural networks API written in Python and capable of running on top of TensorFlow, CNTK, or Theano. It is designed to enable fast experimentation with deep neural networks.

Best JavaScript Open Source Projects

There are a ton of great open source JavaScript projects out there. Here are some of the best ones:

1. React

User interfaces may be created using the JavaScript package React. Declarative, effective, and adaptable describe it. React was created with progressive adoption in mind, so you may use it in whichever quantity you see fit. The React documentation contains options for everyone, whether you want to get going quickly with a few straightforward components or delve deep using Hooks.

1. Angular JS

AngularJS is a JavaScript-based open-source front-end web framework mainly maintained by Google and by a community of individuals and corporations to address many of the challenges encountered in developing single-page applications.

The JavaScript components complement Apache Cordova, a framework used for developing cross-platform mobile apps. It aims to simplify both the development and the testing of such applications by providing a client-side model-view-controller (MVC) architecture, along with components commonly used in rich Internet applications.

1. Node.js

Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient. Node.js' package ecosystem, npm, is the largest ecosystem of open source libraries in the world.

As an asynchronous event-driven JavaScript runtime, Node.js is designed to build scalable network applications. In the following "hello world" example, many connections can be handled concurrently. Upon each connection, the callback is fired, but if there is no work to be done, Node.js will sleep.

1. Express

Express is a fast, unopinionated, minimalist web framework for Node.js.

1. Vue.js

Vue.js is a JavaScript framework for building user interfaces. It was created by Evan You and is released under the MIT license.

Vue.js is a progressive framework, which means it can be used for building single-page applications as well as complex, multi-page web applications. It is also lightweight and fast, making it ideal for mobile applications. If you're looking for a framework to help you build amazing user interfaces, give Vue.js a try.

1. Socket.IO

Socket.IO is a JavaScript library for real-time web applications. It enables real-time, bi-directional communication between web clients and servers. It has been designed to work on multiple platforms, including the web, Desktop, and mobile.

Socket.IO is open-source and easy to use. It is one of the most popular real-time web frameworks available today.

1. React Native

React Native enables you to build world-class application experiences on native platforms using a consistent developer experience based on JavaScript and React. The focus of React Native is on developer efficiency across all the platforms you care about - learn once, write anywhere. Facebook uses React Native in multiple production apps and will continue building new apps with it.

React Native is currently being used by large companies like AirBnB, Skype, Tesla,Uber, walmart and of course, Facebook. It has also been used by smaller companies and startups with great success. Some notable apps built using React Native are Instagram, Facebook, Pinterest, Skype and Tesla.

If you're looking to get started with React Native, there are a few things you need to know. React Native is a framework for building native apps using React.js.

1. TypeScript

TypeScript is a free and open-source programming language developed and maintained by Microsoft. It is a superset of JavaScript, and adds optional static typing and class-based object-oriented programming to the language.

TypeScript is designed for development of large applications and transcompiles to JavaScript. As TypeScript is a superset of JavaScript, any existing JavaScript programs are also valid TypeScript programs.

1. Babel

Babel is a JavaScript compiler. It is used to convert code written in one language (like JavaScript) into another language (like Python).

Babel is open source software. That means that anyone can use it and contribute to it. Babel is maintained by a community of volunteers.

If you're interested in learning more about Babel, or if you want to contribute to the project, check out the links below.

1. Webpack

Webpack is a powerful module bundler, which can transform and bundle all kinds of assets, from simple scripts andstylesheets to more complex JavaScript applications. Webpack is available as a Node.js module and can be installed via npm:

Best JAVA Open Source Projects

1. Jenkins

Jenkins is an open source automation server written in Java.It is used to build and test software projects continuously making it easier for developers to integrate changes to the project. It also has support for plugins to integrate with

1. Hadoop

Hadoop is an open source java based framework for processing, storing and analyzing large data sets. It is banks, social media companies and retailers etc. process large data sets.

1. Google Guava

Google Guava is a set of open source Java libraries from Google which includes collection, caching, primitives support, concurrency libraries, common annotations, string processing and I/O. It is widely used by java developers.

1. Spring Framework

The Spring Framework is a Java platform that provides comprehensive infrastructure support for developing robust Java applications very easily and very rapidly.

1. Eclipse IDE

Eclipse is a popular open source IDE written in Java. It is used for developing Java applications. It has a wide range of plugins to support various technologies.

How to Find Interesting Open Source Projects

Here are a few ways you can find interesting open source projects to contribute to:

1. Check out GitHub Explore.

2. Have a look at Open Source Friday.

3. Check out Awesome Lists.

4. Browse through Open Source Projects.

5. Ask your friends and colleagues if they know of any good open source projects.

Frequently asked questions

What are Some Good Open Source Projects?

There are a lot of great open source projects out there. Here are a few of our favorites:

Linux
Apache HTTP Server
Mozilla Firefox

Each of these projects is well-maintained and offers a high-quality product. We recommend checking them out if you're looking for a new open source project to contribute to.
 

Can I Make Money from Open Source Projects?

The answer is yes, you can earn money from open source projects. In fact, many developers do just that.

There are a few ways to make money from open source projects. The most common is through providing services such as support, consulting, or training. Other ways include selling products that are built on top of open source projects, or developing and selling plugins or extensions.

If you're a developer, the best way to make money from open source projects is to find a project that you're passionate about and start contributing. Once you've made a name for yourself, you can start offering services or products related to the project.

If you're not a developer, you can still make money from open source projects by providing services such as support, documentation, or marketing. You can also create and sell products that are based on open source projects.
Why are Open Source Projects Important?

Open source projects are important for a number of reasons. First, they allow for transparency and collaboration. When everyone can see the code and make contributions, it leads to better-quality software. 

Additionally, open source projects are a great way to learn new programming skills and build your portfolio. And finally, open source projects can be a fun and rewarding way to give back to the community.

If you're thinking about starting an open source project, we encourage you to do so! Not only will you be making a positive impact on the software world, but you'll also be gaining valuable skills and experience.

Conclusion

If you want to improve as a programmer, one of the best things you can do is get involved with open source projects. By collaborating with other developers on real-world projects, you can not only hone your skills but also learn new programming techniques and strategies.

So what are you waiting for? Start searching for open source projects that interest you, and get involved today!