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Top 17 Java Data Science Projects
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And this is, when it doesn't delete data randomly: https://github.com/trinodb/trino/issues/28885 (some enterprise open source was slop before AI even it seems)
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AppSignal
AppSignal knows why the f*#k it crashed. Stop vibe-debugging. Every exception, every backtrace, grouped so you see patterns, not noise.
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OpenRefine
OpenRefine is a free, open source power tool for working with messy data and improving it
Project mention: Securing Test Environments: Preventing PII Leakage with Open Source Linux Tools | dev.to | 2026-02-04"OpenRefine - Data Cleaning", https://openrefine.org/
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Project mention: Tablesaw: Java Dataframe and Visualization Library | news.ycombinator.com | 2026-02-28
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odd-platform
First open-source data discovery and observability platform. We make a life for data practitioners easy so you can focus on your business.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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zingg
Scalable master data management, identity resolution, entity resolution, and deduplication using ML
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DatumBox
Datumbox is an open-source Machine Learning framework written in Java which allows the rapid development of Machine Learning and Statistical applications.
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The Data Engineering Roadmap 2026 covers software engineering, Python, SQL, operational databases, warehouses, lakehouse storage, orchestration, observability, security, and cost. As an inventory of the field, that is helpful. As a checklist for becoming employable, it is too easy to read it as an entrance exam that never ends.
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rumble
Quick start: pip install jsoniq ⛈️ RumbleDB 3.0.0 "Coast Redwood" 🌳 for Apache Spark | Run queries on your large-scale, messy datasets (JSON, text, CSV, Parquet, Delta...) | Data Lakehouse with Updates, Scripting, Declarative Machine Learning and more (by RumbleDB)
Project mention: ETH-Zurich: Digital Design and Computer Architecture; 227-0003-10L, Spring, 2025 | news.ycombinator.com | 2025-11-30This is also the university that develops RumbleDB[0]. It uses JSONiq as its query language which is such a pleasure to work with. It's useful for dealing with data lakes, though I've only experimented with it because of JSONiq.
[0] https://github.com/RumbleDB/rumble
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Fahmatrix
Fahmatrix is a lightweight, modern Java library for working with tabular data, inspired by Python's Pandas and rooted in the idea of making data understanding (fahm) easy on the JVM.
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jscipy
Java Scientific Computing Library - Signal Processing, FFT, Filters, PSD, DCT, SciPy-like APIs for JVM & Android used in Machine Learning and Data Science.
Project mention: JSciPy – The trending Java signal processing library in 2026 | news.ycombinator.com | 2026-01-25 -
petrify
Compile your ML Models/ONNX Decision Trees (XGBoost, LightGBM, SciKit-Learn) straight to JVM Bytecode
Projects like this would be significantly funner and easier to make in Jdk25+(well technically 24+) because of the new Java classfile/bytecode API. It looks like Endive uses OW2 ASM, probably because this supports back to Jdk11. The new jdk API has a minimum target of Jdk17. OW2 ASM is significantly harder to use IMHO though.
What got me into this is I just finished a major release of Petrify (https://github.com/exabrial/petrify) that compiles ML Models to JVM Bytecode. It requires Jdk25 to do the compilation, but the compiled models can run on Jdk17+.
I'm looking for more side projects to use the classfile API on.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
Java Data Science discussion
Java Data Science related posts
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Your Data Engineering Roadmap Is Probably Too Long
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Fahmatrix – A Lightweight, Pandas-Like DataFrame Library for Java (GitHub)
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ClickHouse: The Key to Faster Insights
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[OC] Gender diversity in Tech companies
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What’s your process for deploying a data pipeline from a notebook, running it, and managing it in production?
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I'm just going to say it - I prefer Spyder
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A note from our sponsor - AppSignal
www.appsignal.com | 14 Oct 2026
Index
What are some of the best open-source Data Science projects in Java? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Trino | 13,310 |
| 2 | OpenRefine | 12,025 |
| 3 | Smile | 6,419 |
| 4 | maestro | 3,843 |
| 5 | Tablesaw | 3,764 |
| 6 | odd-platform | 1,435 |
| 7 | hopsworks | 1,301 |
| 8 | zingg | 1,252 |
| 9 | DatumBox | 1,084 |
| 10 | Data-Engineering-Roadmap | 266 |
| 11 | rumble | 248 |
| 12 | nocodefunctions-web-app | 40 |
| 13 | Fahmatrix | 40 |
| 14 | jscipy | 25 |
| 15 | petrify | 7 |
| 16 | Quanta | 2 |
| 17 | java-spark-data-analyzer | 2 |
Sponsored
AppSignal knows why the f*#k it crashed.
Stop vibe-debugging. Every exception, every backtrace, grouped so you see patterns, not noise.
www.appsignal.com