frontpage.
newsnewestaskshowjobs

Open Source @Github

fp.

Show HN: Laser Graffiti

https://laser.consti.de
186•con•2d ago•37 comments

Show HN: We built the smallest dual-band aircraft tracker

https://pantsforbirds.com/the-worlds-smallest-dual-band-ads-b-receiver-module/
80•CoolNamesAllTkn•5d ago•21 comments

Show HN: Markdown Viewer and Editor

https://kingsbridge-consultancy.com/md-viewer/
24•beerglass•11h ago•11 comments

Show HN: FnScribe – Open-source, offline dictation for macOS

https://github.com/AlgorithmicResearchGroup/fnscribe
34•modagent•4d ago•23 comments

Show HN: Corporate Mind Games – logic puzzles with a sarcastic corporate theme

https://corporatemindgames.com/
46•dontwordle•16h ago•13 comments

Show HN: Serendipity – rediscover the web one interesting page at a time

https://serendipity.surf/
3•RaCaS123•4h ago•0 comments

Show HN: Seatlr – We rebuilt our traveler chat into an AI-powered travel network

https://www.seatlr.com/
2•alihadi965•4h ago•0 comments

Show HN: I Built the AI command center that runs all local models in one place

https://generativeide.com/
2•rohangnaneshjh•4h ago•0 comments

Show HN: Floe – an open-source plugin for sample libraries – CLAP/VST3/AU

https://floe.audio/
19•windell•22h ago•9 comments

Show HN: SlideOps – slides from a repo that flag when they drift from the code

https://github.com/glukicov/slideops
21•lukicov•20h ago•5 comments

Show HN: A Curated Library of Hero Sections from Fast-Growing Startups

https://www.herotxt.page/
3•lynn_xx•5h ago•2 comments

Show HN: Saccade – Live semantic browser truth for AI agents

https://github.com/nanlogic/saccade
5•sacravenger•8h ago•0 comments

Show HN: A Bluesky bot that shares Wikipedia links from the HN front page

https://bsky.app/profile/hnwiki.bsky.social
4•doctoboggan•3h ago•0 comments

Show HN: I rebuilt tank game with new style

https://www.battle-tank.com/
3•dutay05•7h ago•0 comments

Show HN: Chaosword – A Crossword?

https://chaosword.com
2•ghosts_•7h ago•0 comments

Show HN: What Happens When You Give Your AI Agents a Voice and an Attitude

https://fellowgeek.github.io/mcp-speak/
9•pcbmaker20•17h ago•5 comments

Show HN: NFC Energy-Harvesting PCB Business Card with an MCU

https://wilsonharper.net/projects/businesscard/
216•WilsonHarper•3d ago•30 comments

Show HN: I missed the moving blocks, so I built a real Linux disk defragmenter

https://github.com/gbin/defragger
96•gbin•6d ago•68 comments

Show HN: Nos4, new nostalgic internet toy. A complete IOS4 right on the browser

https://nos4.fun/
3•1etu•9h ago•0 comments

Show HN: Tubeviz – automatically edit YouTube footage to music

https://github.com/interrupt21h/tubeviz
3•int0x21•11h ago•0 comments

Show HN: cdai – the AI-enhanced cd command

https://github.com/franzenzenhofer/cdai
2•franze•11h ago•0 comments

Show HN: Claude Code Arcade

https://github.com/jystervinou/claude-code-arcade
2•jystervinou•11h ago•0 comments

Show HN: Keel - A conductor, not an agent loop

https://daneb.github.io/keel/
3•danebalia•12h ago•0 comments

Show HN: Typebase – A single-folder back end you write in TypeScript

https://typebase.io
118•andrewww-dev•5d ago•46 comments

Show HN: Guess the AI model from its web design

https://raq.com/blog/can-you-spot-ai-web-design/quiz
5•hawke•12h ago•0 comments

Show HN: Xyzzy – AI teamwork in one Python process, with a tamper-evident log

https://github.com/Project-Nexus-YR/XYZZY
3•Yashiru•13h ago•0 comments

Show HN: Galaxium, an experimental WebGPU space explorer

https://galaxium.app
135•guillaumec•1w ago•40 comments

Show HN: Deslop, a skill that turns legalese and AI slop into plain English

https://github.com/fayerman-source/deslop/
2•fayerman•6h ago•0 comments

Show HN: The load-bearing vocabulary of Claude

https://louisabraham.github.io/load-bearing/
700•Labo333•4d ago•326 comments

Show HN: SubSmith – Turn your own videos into language-learning material

https://subsmith.app
76•IbrahimF96•3d ago•51 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.