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Show HN: Reactor Atlas

https://reactoratlas.com
39•fedecaccia•23h ago•15 comments

Show HN: I made a word building game supporting anagrams and one handed use

16•busymom0•21h ago•1 comments

Show HN: Aurict – An open-source Terminal AI

https://github.com/aurict/aurict
4•hamzakhrmn2•4h ago•2 comments

Show HN: Prices.eu.org

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9•sourcecodeplz•3h ago•3 comments

Show HN: Interactive map of the Japanese address system

https://japanmap.fyi
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Show HN: OwnTime – a chess clock for your day's priorities

https://owntime.app/
108•fmos•2d ago•58 comments

Show HN: HN Match Maker – Matching "Who Wants to Be Hired?" With "Who's Hiring?"

https://hnmatchmaker.com/
115•all2•2d ago•45 comments

Show HN: The cheapest GPU cloud – H100s at $2.04/HR, H200s at $3/HR

https://compute.cheap/
52•EmiCorleone•1d ago•20 comments

Show HN: Real-time AI news aggregator with daily digest

https://aibriefs.news
10•michelmi•21h ago•14 comments

Show HN: Newton's Orchard – Browser-based space/gravity playground

https://newtonsorchard.app
30•andrewchilds•2d ago•4 comments

Show HN: Word42, a wordprocessor inspired by MS Word and Abiword

https://word42.org/
4•roschdal•7h ago•0 comments

Show HN: A gravity simulator where forces propagate at the speed of light

https://github.com/alessandro-pioli/AstroCausal_Engine
6•alessandropioli•19h ago•0 comments

Show HN: Weedout – Safari extension that hides YouTube AI-labeled videos

https://masteranza.github.io/weedout/
181•masteranza•2d ago•81 comments

Show HN: I built my first MCP to manage Google Ads

https://adchestra.com/
15•MichalKrk•23h ago•10 comments

Show HN: asciiQuake

https://asciiquake.wtf/
16•apresmoi•1d ago•6 comments

Show HN: Sirenfall, a civil defense siren synthesized in Web Audio

https://sirenfall.live/
5•beeswaxpat•15h ago•1 comments

Show HN: Running 104GB Qwen3.8-Flash-Next on 48GB Mac with at ~12 tok/s

https://github.com/carloslfu/slotstream
230•carloslfu•2d ago•115 comments

Show HN: A benchmark for flight search intent

https://fjmatrix.github.io/flight-search-intent-eval/
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Show HN: Devbar – Point at what to change. Leave a comment. Your agent ships it

https://devbar.sh
3•linesofcode•16h ago•5 comments

Show HN: Laser Graffiti

https://laser.consti.de
252•con•5d ago•61 comments

Show HN: MesaOS – An operating system written from scratch in Rust

https://github.com/crackanimad0r/MesaOS
3•crackanimador•18h ago•13 comments

Show HN: Bridle: hand your agent's context to a coworker's agent

https://www.bridle.network/
5•withoutshape•18h ago•0 comments

Show HN: NGPDFs – 50 PDF tools that never upload your files

https://ngpdfs.com
2•amulyakashyap09•18h ago•0 comments

Show HN: WordPress search and replace that doesn't corrupt serialized data

https://github.com/ibrahimhajjaj/lucid-search-replace
2•ibrahimwithi•18h ago•0 comments

Show HN: Model – A Minimal Python ORM for MySQL and SQLite

https://github.com/el1s7/model
4•el1s7•18h ago•0 comments

Show HN: MCP Tool Definition Quality Score (TDQS) Spec

https://tdqs.dev
8•punkpeye•18h ago•1 comments

Show HN: LibPolyCall – a C runtime broker for cross-language function calls

https://github.com/obinexus/libpolycall-v1
3•obinexus•19h ago•0 comments

Show HN: Wordmate – local speech-to-text for macOS

https://github.com/vdszds/wordmate
4•vdszds•19h ago•0 comments

Show HN: Radia – agent coordination with leases, permissions and provenance

https://radia.sh/
2•ymodulo•19h ago•0 comments

Show HN: I built an app that makes your goals inevitable

https://www.getinference.app/
2•ifeanyi_sa•19h ago•0 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.