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Show HN: Ghost Pepper – Local hold-to-talk speech-to-text for macOS

https://github.com/matthartman/ghost-pepper
392•MattHart88•15h ago•178 comments

Show HN: GovAuctions lets you browse government auctions at once

https://www.govauctions.app/
288•player_piano•18h ago•81 comments

Show HN: AdaShape-3D modeler for intuitive 3D printing parts / Windows 11

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Show HN: Anos – a hand-written ~100KiB microkernel for x86-64 and RISC-V

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Show HN: Hippo, biologically inspired memory for AI agents

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103•kitfunso•13h ago•21 comments

Show HN: Tusk for macOS and Gnome

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104•factorialboy•3d ago•34 comments

Show HN: TTF-DOOM – A raycaster running inside TrueType font hinting

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Show HN: LLMs as Planners, Not Reasoners

https://github.com/dkohlsdorf/gemini_prolog/
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Show HN: I built a tiny LLM to demystify how language models work

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876•armanified•1d ago•129 comments

Show HN: Real-time AI (audio/video in, voice out) on an M3 Pro with Gemma E2B

https://github.com/fikrikarim/parlor
274•karimf•1d ago•35 comments

Show HN: Gemma Gem – AI model embedded in a browser – no API keys, no cloud

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152•ikessler•1d ago•21 comments

Show HN: Weird Clocks

https://clocks.specr.net
43•vunderba•19h ago•13 comments

Show HN: System that keeps apps running when a server or region goes down

3•krish678•4h ago•0 comments

Show HN: I made a YouTube search form with advanced filters

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314•nevernothing•1d ago•198 comments

Show HN: Development Driven Testing, Why TDD Is Not the Best Approach

https://www.blundergoat.com/articles/development-driven-testing
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Show HN: Modo – I built an open-source alternative to Kiro, Cursor, and Windsurf

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98•mohshomis•1d ago•22 comments

Show HN: A game where you build a GPU

https://jaso1024.com/mvidia/
951•Jaso1024•2d ago•185 comments

Show HN: Docking – Extensible Linux dock in Python

https://docking.cc
26•edumucelli•3d ago•8 comments

Show HN: Niquests – A Requests fork, three years of catching Python's HTTP up

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Show HN: OsintRadar – Curated directory for osint tools

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83•lexalizer•2d ago•9 comments

Show HN: M. C. Escher spiral in WebGL inspired by 3Blue1Brown

https://static.laszlokorte.de/escher/
173•laszlokorte•2d ago•28 comments

Show HN: Meta-agent: self-improving agent harnesses from live traces

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9•essamsleiman•15h ago•0 comments

Show HN: I just built a MCP Server that connects Claude to all your wearables

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17•anton_salcher•1d ago•12 comments

Show HN: I built a site that turns your Steam gaming hours into a RL skill tree

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6•naorz•13h ago•1 comments

Show HN: Contrapunk – Real-time counterpoint harmony from guitar input

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116•waveywaves•2d ago•54 comments

Show HN: Physical constants from 2 integers – MIT, 1225 tests, falsifiable

https://bpr.thestardrive.com
3•iq19zero•10h ago•0 comments

Show HN: ReverseCam – See yourself as others see you

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8•ilamparithi•19h ago•1 comments

Show HN: Luigis-meter – Claude Code Max quota in your statusline

https://github.com/Luigigreco/luigis-meter
2•lgreco•11h ago•0 comments

Show HN: The two storage engine families behind every database (animated) [video]

https://www.youtube.com/watch?v=c4YtYzyAf3I
2•rcron•4h ago•0 comments

Show HN: Visualizing React Server Component Boundaries in Next.js

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2•valentinprgnd•12h 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•10mo 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•10mo 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•10mo 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•10mo 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•10mo 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•10mo ago
Polars and duckdb interoperate nicely and can enable this flexibility
theanonymousone•10mo ago
Does Polars have a Java library?
mousomashakel•10mo 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.
theanonymousone•10mo 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•10mo 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.
skanga•10mo ago
What about Tablesaw, Apache Arrow? How does this compare ...
mousomashakel•10mo 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•10mo ago
Nice!

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

mousomashakel•10mo 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.