Announcing C-Blosc2 2.21.2: A fast, compressed and persistent binary data store library for C! This is a maintenance release, with a few fixes and some optimizations. Check out the full release notes here: github.com/Blosc/c-blos... Donate to Blosc: numfocus.org/donate-to-bl...

💙 pyMOR just released pyMOR 2025.1! This release introduces a major breaking change in pyMOR’s VectorArray API, along with a few new features. Check them out here: bit.ly/42LU7gh

Recently, rOpenSci held some fabulous community sessions on new ways to publish R packages and how to ship your R package to the R-multiverse! Stay up to date on their next events here: ropensci.org/events/ 💯 Donate to rOpenSci: numfocus.org/donate-to-ro...

On behalf of the Spyder Project Contributors, we’re pleased to announce that Spyder 6.0.8 has been released and is available for Windows, GNU/Linux and MacOS X! 🕷️ This release fixed input method positioning for the Editor and IPython Console. Donate to Spyder: numfocus.org/donate-for-s...

Optuna has released CARBOSampler, a sampler for robust Bayesian optimization, and the C-DTLZ constrained multi-objective optimization benchmark set packages on OptunaHub. They are also working on Optuna-Dashboard LLM integration functionalities that manipulate data with natural language. Good luck!😍

On behalf of the NumPy team, we’re pleased to announce the release of NumPy 2.3.3. The NumPy 2.3.3 release is a patch release split between a number of maintenance updates and bug fixes. This release supports Python 3.11–3.14. 🩵

A Zarr Summit is currently being hosted in Rome, Oct. 13-17, 2025! Zarr currently has over 60 registrants representing 50+ organizations, 5+ continents, and Zarr usage across Python, R, C++, Rust, APIs, GUIs, and more! 🤩🐍🔬

Mesa had an exceptional Google Summer of Code (GSoC)! With its completion, they have three exciting improvements to Mesa: Mesa Frames 0.2, Mesa-LLM, & Mesa 3.3, This is incredible, congrats Mesa!

The 4th Dynare Workshop for Advanced Users took place from Sep. 17-19, 2025, at the Joint Research Centre of the European Commission in Ispra, Italy. The Dynare Team showcased their latest software developments alongside participants from policy institutions and academia. Congrats, Dynare! 💙

Julia version 1.11.7, the seventh patch release in the 1.11 series, is now available! As a patch release, 1.11.7 contains no new features or breaking changes, only bug fixes, documentation improvements, and performance improvements. 🙏

We can’t wait for the 10th-anniversary PyBay 2025 NEXT WEEK! Join NumFOCUS and connect with developers and programmers in the Bay Area for all things Python! pybay.org

The Hopsworks Feature Store Summit 2025 takes place in just a week, and we couldn’t be happier to be a featured community partner! 🧡 This year, the summit will focus on real-time systems, LLM pipelines, and vector-native architectures for AI. Register here for free! www.featurestoresummit.com

We’re proud to partner with Hopsworks for their Feature Store Summit 2025, which will take place online on Oct. 14! We’ve got a star-studded speaker lineup, with talks from developers at Uber, Pinterest, and Roku, just to name a few! Register here: www.featurestoresummit.com

NumFOCUS is thrilled to partner with PyBay for their 10th anniversary conference in San Francisco, Oct. 18! Join us and dozens of other enthusiastic and established developers in the beautiful Bay Area for software development, data science, community, and of course: Python! pybay.org

Our September round of monthly project updates is here! Check ‘em out here: numfocus.medium.com/september-20...

Our September round of monthly project updates is here! Check ‘em out here: numfocus.medium.com/september-20...

Funding fuels innovation. NumFOCUS helps projects find stability through sponsorship + grants. Your gift keeps open code powering science. Back the Stack. Fuel the Future: bit.ly/3HPryqN

pandas is pleased to announce the release of v2.3, and is seeking testers for their upcoming 3.0 release! See the upcoming changes in pandas 3.0 for more details about what changes are coming: pandas.pydata.org/docs/whatsne... Donate to pandas: numfocus.org/donate-to-pa...

📣 On Sept. 25, NVIDIA will be hosting a virtual Connect with Experts with the CUDA Core Libraries Team. If you have ever wanted to learn about GPU computing and writing custom CUDA kernels in both C++ and Python, this is the team you want to talk to! bit.ly/4nxkChk

We have released version 4.5 of the black-box optimization framework Optuna. This release includes new features and significant performance improvements, such as GPSampler for constrained multi-objective optimization and much more! Full release notes here: github.com/optuna/optun...

Tomorrow is Software Freedom Day! 🧠 Here at NumFOCUS, we've seen the impact of open-source extend as far as [BioTech] [Sustainability] [AI] Knowledge and data should remain free and accessible for all. Back the Stack by donating today to ensure the future of open-source! bit.ly/3HPryqN

One month ago, Blosc presented multiple exciting talks, tutorials, and sprints at EuroSciPy 2025! Check out the slides to their Talk, “Blosc2: Compress Better, Compute Bigger,” here! www.blosc.org/docs/2025-Eu... Donate to Blosc: numfocus.org/donate-to-bl...

DISC Unconferences: Diverse teams brainstorming real-world solutions for a more inclusive future in open science. An ML Engineer said, “This event isn’t just about learning; it’s about building a movement. It’s a catalyst for real change.” Back the Stack. bit.ly/3HPryqN

Skforecast 0.17.0 has just been released! 🎉 This release represents a significant step forward for deep learning forecasting in skforecast, expanding what you can do with RNN-based models and probabilistic predictions. Get the full details here: skforecast.org/0.17.0/relea...

✨ CuPy v13.5 is now available! It now supports CUDA 12.9, ROCm 6.4, & NumPy 2.3. This release also brings CUDA’s Unified Memory Programming support for HMM/ATS-enabled systems. Check out the release notes for the full details! github.com/cupy/cupy/re... Donate to CuPy: numfocus.org/donate-for-c...

The fifth annual MFEM Community Workshop just took place in hybrid format on September 10-11 at Portland State University in Portland, OR, and online via Zoom! Cheers to MFEM! ♥️

We’re thrilled to once again be featured community partners of Hopsworks’ Feature Store Summit 2025, taking place online on Oct. 14! Experience an incredible lineup of sessions showcasing the latest advancements in feature stores! Register here: www.featurestoresummit.com

PyBaMM 25.8 has been released! Support for Python 3.9 has been removed in this release; the supported Python versions are now 3.10 to 3.12. Check out the full overview here: pybamm.org/news/2025/08... Donate to PyBaMM: numfocus.org/donate-for-p...

In 2024 alone, PyData hosted: [434 conferences, meetups, and workshops] [Over 100 countries with MeetUp chapters] [10 project & community events] We bring together people to keep knowledge open and accessible. Join us in fueling the future: hubs.la/Q03HR1HT0

Small Development Grants = big change. Docs, accessibility, tutorials, events—NumFOCUS microgrants fuel the improvements that make open science stronger and more inclusive. Back the Stack. Fuel the Future. bit.ly/3HPryqN

“It’s hard to find funding for docs & maintenance. Without it, code collapses under technical debt. NumFOCUS helps us move forward.” — Ryan Curtin, mlpack See what else he says at: youtu.be/PrIgt0Pqi9M Back the Stack: bit.ly/3HPryqN

Infrastructure matters. NumFOCUS provides Sponsored Projects with tools like Zoom, shared drives, JetBrains licenses, and domain support—so developers can focus on building. Back the Stack. Fuel the Future. bit.ly/3HPryqN

"NumFOCUS helped us take @pymc.io to the next level… filling the gaps our developers couldn’t.” — Chris Fonnesbeck (@fonnesbeck.bsky.social)‬. This is why your support matters. Back the Stack to Fuel the Future at bit.ly/3HPryqN #BackTheStack #NumFOCUS

The future of discovery depends on open tools. When you support NumFOCUS, you: [Keep projects stable] [Build strong communities] [Invest in new talent] Together, we can keep science open and accessible for everyone. Back the Stack. Fuel the Future. Donate at bit.ly/3HPryqN

rOpenSci is very excited to introduce the new rOpenSci Champions! They will participate in the program and carry out their work in Spanish, allowing them to continue strengthening the open science and research software development community in this language. Read more: ropensci.org/blog/2025/07...

Optuna has released version 0.19.0 of optuna-dashboard! The design document for LLM integration into optuna-dashboard is also publicly available, and optunahub is now available on conda-forge. Congrats on all these exciting updates, Optuna! 💙

Reminder: If you’d rather not be migrated to Zulip, you can opt out until September 26th, 2025. 👉 forms.gle/puxSq5sqt42U...

After lots of hard work by the team, AiiDA v2.7.0 has finally been released! 🎉 This minor release comes with various new features, like asynchronous SSH connections, Python 3.13 support, and much more. Check out the full changelog: aiida.readthedocs.io/projects/aii...

MDAnalysis recently announced its 2025 UGM, which is scheduled for November 9–11 in Tempe, Arizona, with virtual participation options available. Two keynote speakers have been confirmed: Dr. Lillian Chong (University of Pittsburgh) and Dr. Matthias Heyden (Arizona State University)! bit.ly/4ovMUdn

marimo announced molab, a cloud-hosted marimo notebook workspace with link-based sharing, letting you experiment on data using the world’s best Python notebook. They’re giving molab (mo for marimo) to you, our community, for free! molab is available at molab.marimo.io/notebooks

SPHinXsys recently released V1.2 with a new surface tension model and GPU offloading for mesh dynamics. Also, the heterogeneous parallel paradigm used by SPHinXsys was presented at the SPHERIC World Conference 2025! 👏

Blosc has rolled out new versions of the `blosc2` Python package, introducing new 'concat' and 'stack' functions, as well as lower memory usage and orthogonal indexing. Learn more here: www.blosc.org/posts/blosc2...

pyMOR School and User Meeting 2025 will be held in Zagreb, Croatia, from September 8–12. Anyone interested in model order reduction or pyMOR is welcome. Registration is free and open until August 25! 2025.school.pymor.org

BayesFlow released version 2.0.4, presented numerous findings at the MathPsych/ICCM 2025 conference at Ohio State University, and expanded its contributor list to 25 active members! Congrats to BayesFlow on all these new huge accomplishments!

HoloViz’s Panel Material UI v0.3, the new Material Design extension for Panel that enables Python developers to build modern responsive web apps, delivered numerous improvements, including new widgets, renamed components, Plotly visualization support, and a complete documentation overhaul. 🖤

Welcome to the NumFOCUS family, our latest Affiliated Project, the Materials Project Software Foundation! ⚛️ The mission of the MPSF is to provide community-driven, inclusive, governance of select public-facing and open-source Materials Project software packages! next-gen.materialsproject.org

👋 Still on Slack? Here’s what to expect during our transition to Zulip: - Automatic account migration ✅ - Option to import private convos 🕵️ - Open-source future ahead! ➡️ Details: medium.com/@numfocus/sw...

It’s time for another round of updates from NumFOCUS and our projects: July 2025 edition! 🎉Check out our full blog post here: numfocus.medium.com/july-2025-pr...

This year, rOpenSci have selected ten talented individuals from Latin America who bring a unique combination of experience, enthusiasm, and commitment to open science for the rOpenSci Champions Program! rOpenSci had quite a busy June, read more on their blog here: ropensci.org/blog/2025/06...

With contributions from 17 community members, pvlib python released version 0.13.0! This patch included several breaking changes to improve consistency in the PVGIS pvlib.iotools functions, and much more. Check out the full changelog here! pvlib-python.readthedocs.io/en/stable/wh...