Hacktoberfest 2025 is here, and we’re proud to be back for our third year. Each October, developers from around the world come together to contribute to open source, and we are excited to once again invite the developer community to get involved.
Whether you are contributing for the first time or returning after last year, Hacktoberfest is a great way to learn, share, and collaborate.
Why Esri participates
At Esri, we believe that open source empowers developers. Projects like Esri Leaflet, Calcite Design System, and ArcGIS REST JS are built with contributions from both our team and the wider community.
In the past two years, amazing contributions have ranged from bug fixes to documentation improvements. You can read more about those successes in our Hacktoberfest 2024 recap and Hacktoberfest 2023 wrap-up.
Hacktoberfest gives us a chance to connect with the community, work on meaningful improvements, and support each other through shared solutions and ideas.
How to Join
Participating in Hacktoberfest is simple:
- Visit the Esri GitHub organization.
- Browse the repositories tagged for Hacktoberfest.
- Look for issues labeled good first issue or help wanted.
- Submit your pull requests between October 1 and October 31.
Each project has its own contributing guidelines, so give those a quick read before you open a pull request. Pull requests must be accepted and merged to count toward Hacktoberfest.
And if you have any questions along the way, feel free to reach out to us in GitHub discussions or issues.
The Repositories
Here are some of the Esri open source projects you can contribute to this year:
- Esri Leaflet Vector – vector tile layers for Esri Leaflet.
- Esri Leaflet Geocoder – simple geocoding with Esri Leaflet.
- ArcGIS REST JS – lightweight library for calling ArcGIS REST APIs.
- Calcite Design System – reusable UI components and patterns.
- Awesome ArcGIS Developers – curated list of resources for developers.
Let’s Build Together
We are proud to support Hacktoberfest again this year and look forward to seeing what you contribute. Whether you are fixing bugs, improving documentation, or submitting new ideas, your work helps others and strengthens the tools we build together.
Thank you for being part of the Esri open source community.
Happy Hacktoberfest!
Article Discussion: