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Show HN: I am building a map of people who lived in the Roman Empire

https://new.roman-names.com/
168•metiscus•3d ago•39 comments

Show HN: Paca – Lightweight Jira alternative for human-AI collaboration

https://github.com/Paca-AI/paca
146•pikann22•21h ago•54 comments

Show HN: Motplot is a crossword but it plays like Sudoku

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4•jamwise•2h ago•1 comments

Show HN: Bastion – isolated Linux VMs for background coding agents

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5•almostlit•4h ago•0 comments

Show HN: I run a vision model on every screenshot, locally, on a 4GB GPU

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16•skye0110•7h ago•1 comments

Show HN: 2 Weeks of Hallucinate – The Photo Gallery

https://hallucinate.site/gallery
68•stagas•18h ago•24 comments

Show HN: Inkwash, a watercolor sketching app and explanation

https://johnowhitaker.github.io/inkwash/about
3•Yenrabbit•4h ago•3 comments

Show HN: Lightweight Task queue on Erlang/OTP, SQLite-backed, no overengineering

https://github.com/entGriff/ezra
70•ent1c3d•3d ago•10 comments

Show HN: Putt.day a daily mini golf game

https://putt.day/
301•ellg•1d ago•108 comments

Show HN: Homebrew 6.0.0

https://brew.sh/2026/06/11/homebrew-6.0.0/
1442•mikemcquaid•2d ago•353 comments

Show HN: Quant Picker – which GGUF file fits your model and machine

https://vettedconsumer.com/quant-picker/
15•ermantrout•19h ago•0 comments

Show HN: I created a simple searchable list of abandoned WordPress Plugins

https://vimsy.io/plugin-graveyard
3•arximughal•3h ago•0 comments

Show HN: A bunch of Apache2/MIT log generators

https://github.com/expanso-io/log-simulators
4•TheIronYuppie•7h ago•0 comments

Show HN: Lightweight C++23 S3 client with no extra deps (just curl and OpenSSL)

https://github.com/ggcr/s3cpp
5•ggcr•14h ago•2 comments

Show HN: StackScope – I crawled over 40k indie launches to see what they ship

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62•datafreak_•1d ago•17 comments

Show HN: Skill for your agent to visualize your gbrain and Obsidian

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20•v_ignatyev•1d ago•15 comments

Show HN: FablePool – pool money behind a prompt, and Fable builds it in public

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518•matthewbarras•2d ago•273 comments

Show HN: Boo – Screen-style terminal multiplexer built on libghostty

https://github.com/coder/boo
93•kylecarbs•2d ago•28 comments

Show HN: Turn your name into a tree in an infinite procedural shanshui landscape

https://landscape.bairui.dev/
39•subairui•3d ago•20 comments

Show HN: Extend UI – open-source UI kit for modern document apps

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249•kbyatnal•3d ago•80 comments

Show HN: Slopsome – a VRAM fit calculator and tok/s database for local LLMs

https://slopsome.com
3•NexAIGuy•11h ago•0 comments

Show HN: Claw Patrol, a security firewall for agents

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108•rough-sea•4d ago•28 comments

Show HN: Galdor – a Go LLM agent framework with built-in tracing and replay

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6•yassros16•11h ago•1 comments

Show HN: HelixDB – A graph database built on object storage

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156•GeorgeCurtis•3d ago•42 comments

Show HN: Bye-wk – Hide World Cup news from your feed

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6•kjex0•9h ago•3 comments

Show HN: Script to bulk delete Claude chats from the web UI

https://github.com/MatteoLeonesi/bulk-delete-claude-chat
59•ML0037•1d ago•20 comments

Show HN: Gravity – Interactive solar-system simulator, from Newton to Einstein

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216•qunabu•4d ago•52 comments

Show HN: Brightdeck – an OOXML-compatible AI presentation maker

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11•mfn-throw•14h ago•2 comments

Show HN: Reality Kernel – A causal containment sandbox for autonomous AI agents

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2•Tabrez416•15h ago•0 comments

Show HN: OmnySSH – TUI SSH manager with dashboard, SFTP and snippets (Rust)

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4•hartmann7•15h ago•1 comments
Open in hackernews

Show HN: Fahmatrix – A Lightweight, Pandas-Like DataFrame Library for Java

https://github.com/moustafa-nasr/fahmatrix
46•mousomashakel•1y ago
Hey HN, I’ve built Fahmatrix, a minimal, fast Java library for working with tabular data — inspired by Python’s pandas, but designed for performance and simplicity on the JVM.

After working extensively with Python’s data stack, I often ran into limitations related to speed, especially in larger or long-running data workflows. So I built Fahmatrix from scratch to offer similar APIs for manipulating CSVs, performing summary statistics, slicing rows/columns, and more — but all in Java.

Features:

Lightweight and dependency-free

CSV/TSV import with auto-headers

Series/DataFrame structures (like pandas)

describe(), mean(), stdDev(), percentile() and more

Fast parallel operations on numeric columns

Java 17+ support

Docs: https://moustafa-nasr.github.io/Fahmatrix/ GitHub: https://github.com/moustafa-nasr/fahmatrix

I’d love feedback from the Java and data communities — especially if you’ve ever wanted a simple dataframe utility in Java without needing full-scale ML libraries.

Happy to answer any questions!

Comments

rickette•1y ago
Congrats on putting this out there. There isn't a de facto pandas-like library in Java like you said. But for Kotlin there is: https://github.com/Kotlin/dataframe
mousomashakel•1y ago
Thanks so much! Yep, I’ve seen the Kotlin DataFrame lib — very elegant. Fahmatrix is meant for plain Java users who want similar capabilities without switching ecosystems. Appreciate the support!
uwemaurer•1y ago
Always great to see efforts to make working with data frames easier. Here are some similar data frame libraries for Java:

https://github.com/jtablesaw/tablesaw

https://github.com/dflib/dflib

My preferred way is just use duckdb java API. I didn't see anything better in performance/efficiency. Also a SQL query is often easier to write

theanonymousone•1y ago
Yes. It has bothered me for a long time too. Maybe the best mix is a dataframe library with basic operations (column select, non-null etc), which also allows SQL for more complex stuff?
radus•1y ago
Polars and duckdb interoperate nicely and can enable this flexibility
theanonymousone•1y ago
Does Polars have a Java library?
mousomashakel•1y ago
Totally agree that SQL can be the best tool for many jobs. My goal with Fahmatrix is to serve the opposite niche: where devs want something that's Java-native, procedural, and simple without reaching for an external engine. SQL support or DSL might come later though — I see the appeal.
skanga•1y ago
What about Tablesaw, Apache Arrow? How does this compare ...
mousomashakel•1y ago
Good question. I’ll publish benchmarks soon, but the core difference is that Fahmatrix is fully Java, no JNI, and minimalistic — ideal for small projects or environments like Android. Tablesaw and Arrow are more powerful, but heavier. Fahmatrix aims to be the “just enough” middle ground.
owlstuffing•1y ago
Nice!

I’m currently using manifold-sql with duckdb for this.

mousomashakel•1y ago
Thanks! That’s a great combo — manifold-sql + duckdb gives you strong typing with powerful SQL under the hood. Fahmatrix is aiming to complement that approach for cases where you want quick, native Java code without SQL — e.g., when building data flows or custom logic inline. Would love to hear if you’ve hit any pain points that a Java-native approach could help with.
theanonymousone
•
1y ago
Sure. So maybe notehr comment would be to make it (particularly the Series class), as compatible with Java Streams as possible.

Next step would likely be compatibility with popular libraries such as Apache Commons Math: https://commons.apache.org/proper/commons-math/userguide/sta...

mousomashakel•1y ago
Thanks! I'm aware of those great projects. Fahmatrix aims to offer a lightweight, dependency-free alternative that’s easy to embed in any Java app. DuckDB is super impressive, especially for SQL-heavy tasks — but my goal is more about a native, fluent API for those who prefer direct Java code over SQL.