Check out the new 2025 Arduino Open Source Report!

Amidst the flurry of Arduino Days 2026 announcements, don’t miss the release of our annual look back at the open-source ecosystem we all build together! The 2025 Arduino Open Source Report is now available (just click to download here), documenting another incredible year of contributions from both the Arduino team and the global community of open-source makers, educators, engineers, and enthusiasts.

As 2025 marked Arduino’s 20th anniversary, this edition of the report is a testament to how far what began as a project to make embedded electronics accessible has grown, over two decades, into a thriving ecosystem of tens of millions of people, thousands of companies, and an ever-expanding pool of shared knowledge and resources. Let’s celebrate some incredible milestones!

Highlights we’re proud to share

Throughout 2025, at Arduino we continued on our ambitious schedule of new releases and investment in open-source foundations. 

• Six new open-source hardware boards were released, including Arduino® UNO^™ Q, Arduino® Nano^™ Matter, and four new Arduino® Modulino^™ modules (Vibro, Latch Relay, Light, and Joystick). Full schematics and CAD files are available for all of them in Arduino Docs.
• UNO Q launched with the first stable Zephyr-based core, marking a major milestone in our transition away from Mbed OS. We also released five beta versions of Arduino core on Zephyr and contributed 74 patches to the upstream Zephyr project, many supporting the new dynamic loader.
• Arduino® App Lab debuted as a new open-source environment for creating applications on UNO Q, combining microcontroller and Linux-based development in a unified workflow. The modular Brick system simplifies advanced tasks like AI model integration, and we’re continuously expanding the library of examples and components.
• Some contributions are less visible, but still worth a shoutout! In addition to proactive security activities and contributions to upstream projects like Zephyr, MicroPhython, and Linux, our team shipped 13 new releases of official cores for RP2040, STM32, nRF52, and Renesas; released 5 full images of Debian-based Linux distro; delivered 11 new official libraries and 93 library updates; and published multiple updates of Arduino App CLI, Arduino IDE 2, Arduino CLI, Arduino Lab for MicroPython, Arduino Cloud CLI, and more.

The open-source community is stronger than ever

The community side of the report is equally impressive, in quantitative terms and especially for the deep collaborative spirit it reflects.

• 1,218 new libraries were added to the Library Manager in 2025, bringing the total to 8,754. This year also marked the 10th anniversary of the Library Manager system itself, introduced in Arduino IDE 1.6.2 back in 2015.
• 6,602 new library versions were released by community maintainers throughout the year. Special recognition goes to Rob Tillaart for the highest number of both new libraries added (50) and new releases (399) in the year, making him the most active library maintainer.
• 420 new projects were added to Arduino Project Hub: a 14% increase over 2024, bringing the total to over 6,000 curated, high-quality projects available for inspiration and learning.
• 215 new versions of community-maintained Arduino boards were released, expanding hardware support across an increasingly diverse ecosystem.

Download and keep up the good work!

While the report focuses on measurable contributions, we acknowledge that much of what makes the open-source community vibrant happens in spaces we can’t easily quantify: tutorials shared on personal blogs, code examples posted in forums, exchanges happening in classrooms and maker spaces around the world. We do our best to highlight success stories and learning lessons on our blog, website, and social media: if you see (or are!) someone who’s really making a difference in the open-source field, please reach out so we can share inspiring stories for the whole community.

No matter where you are on your journey, we hope the Arduino Open Source Report encourages you to keep experimenting, sharing, and building together. If you’d like to discuss or share your own contributions, join the conversation in the Arduino Forum.

Thank you to everyone who contributed to making 2025 another incredible year. Here’s to the next chapter of open-source collaboration.

Arduino, UNO, Nano, and Modulino are trademarks or registered trademarks of Arduino S.r.l.