# Support open source and earn a limited edition T-shirt!

Start Hacking
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## Event details

Hacktoberfest® is open to everyone in our global community. Whether you’re a developer, student learning to code, event host, or company of any size, you can help drive growth of open source and make positive contributions to an ever-growing community. All backgrounds and skill levels are encouraged to complete the challenge.

- Hacktoberfest is open to everyone in our global community!
- Pull requests can be made in any GitHub-hosted repositories/projects.
- Sign up anytime between October 1 and October 31.

## Rules

To qualify for the official limited edition Hacktoberfest shirt, you must register and make four pull requests (PRs) between October 1-31 (in any time zone). PRs can be made to any public repo on GitHub, not only the ones with issues labeled Hacktoberfest. If a maintainer reports your pull request as spam or behavior not in line with the project’s code of conduct, you will be ineligible to participate. This year, the first 50,000 participants who successfully complete the challenge will earn a T-shirt.

Read more about participation details.

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## Hacktoberfest projects

You can contribute to any project on GitHub. Here are a few looking for some help:

Displaying all Hacktoberfest projects

### matomo

PHP

Liberating Web Analytics. Star us on Github? +1. Matomo is the leading open alternative to Google Analytics that gives you full control over your data. Matomo lets you easily co...

#13950

Allow reenabling cookies

### react-rails

JavaScript

Integrate React.js with Rails views and controllers, the asset pipeline, or webpacker.

#1024

Permanent Turbolinks components without a specified cache ID will be loaded for all components without a cache ID

### hugo

Go

The world’s fastest framework for building websites.

#3568

Slash issue in themesDir and similar settings

### dotty

Scala

Research compiler that will become Scala 3

#1589

Missing error messages

### PowerShell

C#

PowerShell for every system!

#1559

CI check for files encoding

### sentry

Python

Sentry is cross-platform application monitoring, with a focus on error reporting.

#11907

Prevent Referer leaking on password reset page

### mycroft-core

Python

Mycroft Core, the Mycroft Artificial Intelligence platform.

#2332

Add basic testcases for the audioservice interface

### java-design-patterns

Java

Design patterns implemented in Java

#834

Maven build fail - Project "image-microservice" pom.xml lack of version field

### ODM

Python

A command line toolkit to generate maps, point clouds, 3D models and DEMs from drone, balloon or kite images.

#1028

[Feature Request] Corner Point Coordinates for input images

## Projects focused on climate change

Because we believe open source technology has the potential to change the world, we wanted to showcase a few projects focused on combating climate change:

### climate

Jupyter Notebook

Mirror of Apache Open Climate Workbench

### contributor_covenant

CSS

Pledge your respect and appreciation for contributors of all kinds to your open source project.

### tmrowapp-contrib

JavaScript

Tomorrow automatically calculates the climate impact of your daily choices by connecting to apps and services you already use.

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## Global events

Celebrate and support open source technology by organizing or attending a local event.

October 15
NightClazz Hacktoberfest Nantes, France
October 19
Hacktoberfest Dublin 2019 Dublin, Ireland
October 01
Hacktoberfest LDN at Twilio London, United Kingdom
October 15
Hacktoberfest Open Hack Night in Seattle Seattle, United States
See more events
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## Words from our sponsors

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We’re so excited to partner with DEV – an open source community platform built for developers of all backgrounds and experience levels – for this year’s Hacktoberfest. As a torch-bearer for open source, transparency, and inclusion in tech, DEV fully embodies the Hacktoberfest values. Check out the #Hacktoberfest tag on DEV for announcements and resources before, during, and after the event.

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As participants long before we became sponsors, we’re thankful to our friends at DigitalOcean for creating Hacktoberfest. As an advocate of developers and startups, their cloud platform uniquely hits on both simplicity and scalability. And their Community platform has become a global resource for education on development and DevOps topics, further illustrating that they, too, are stewards of open source.