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Show HN: Pangolin – Open source alternative to Cloudflare Tunnels

https://github.com/fosrl/pangolin
222•miloschwartz•10h ago•36 comments

Show HN: Interactive pinout for the Raspberry Pi Pico 2

https://pico2.pinout.xyz
39•gadgetoid•3d ago•5 comments

Show HN: Cactus – Ollama for Smartphones

https://github.com/cactus-compute/cactus
142•HenryNdubuaku•13h ago•55 comments

Show HN: Code is all you need – Sherlog MCP

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3•randomaifreak•57m ago•0 comments

Show HN: Open source alternative to Perplexity Comet

https://www.browseros.com/
211•felarof•14h ago•74 comments

Show HN: I built a playground to showcase what Flux Kontext is good at

https://fluxkontextlab.com
51•Zephyrion•1d ago•14 comments

Show HN: CXXStateTree – A modern C++ library for hierarchical state machines

https://github.com/ZigRazor/CXXStateTree
39•zigrazor•4d ago•31 comments

Show HN: asyncmcp – Run MCP over async transport via AWS SNS+SQS

https://github.com/bh-rat/asyncmcp
27•bharatgel•15h ago•2 comments

Show HN: Typeform was too expensive so I built my own forms

https://www.ikiform.com/
176•preetsuthar17•23h ago•91 comments

Show HN: MCP server for searching and downloading documents from Anna's Archive

https://github.com/iosifache/annas-mcp
244•iosifache•1d ago•76 comments

Show HN: FlopperZiro – A DIY open-source Flipper Zero clone

https://github.com/lraton/FlopperZiro
345•iraton•1d ago•73 comments

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https://offchess.com
362•avadhesh18•2d ago•162 comments

Show HN: BreakerMachines – Modern Circuit Breaker for Rails with Async Support

https://github.com/seuros/breaker_machines
42•seuros•4d ago•18 comments

Show HN: I just deployed GovDocs – which use AI to make SA gov docs searchable

https://www.govdocs.co.za/
2•Ntuthuko_hlela•8h ago•0 comments

Show HN: Petrichor – a free, open-source, offline music player for macOS

https://github.com/kushalpandya/Petrichor
192•kushalpandya•1d ago•103 comments

Show HN: Ten years of running every day, visualized

https://nodaysoff.run
20•friggeri•16h ago•8 comments

Show HN: Cursor Rules Generator

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2•prasadpilla•12h ago•0 comments

Show HN: NYC Subway Simulator and Route Designer

https://buildmytransit.nyc
196•HeavenFox•3d ago•31 comments

Show HN: Activiews – A privacy-first fitness alternative for Apple users

http://activiews.xyz/
2•ahmetomer•13h ago•0 comments

Show HN: Virby, a vfkit-based Linux builder for Nix-Darwin

https://github.com/quinneden/virby-nix-darwin
20•qeden•4d ago•1 comments

Show HN: Endorphin AI–Run browser E2E tests from plain English with QA AI agent

https://endorphinai.dev
11•papapin777•15h ago•17 comments

Show HN: I rewrote an outdated React Native map clustering library

https://github.com/suwi-lanji/rn-maps-clustering
30•hadat•2d ago•7 comments

Show HN: Jukebox – Free, Open Source Group Playlist with Fair Queueing

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121•skeptrune•2d ago•43 comments

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99•ShadowUnknown•2d ago•50 comments

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Show HN: Pg-when– psql extension for creating time values with natural language

https://github.com/frectonz/pg-when
2•jossephus01•16h ago•0 comments

Show HN: I wrote a "web OS" based on the Apple Lisa's UI, with 1-bit graphics

https://alpha.lisagui.com/
511•ayaros•4d ago•141 comments

Show HN: I rebuilt few years old project and now it covers my expenses

https://www.hextaui.com/
7•preetsuthar17•18h ago•3 comments

Show HN: I Built an AI Agent Ecosystem That Optimises Your Google Ads for You

https://groas.ai
3•ttttransformer•19h ago•2 comments

Show HN: I built an app to turn my kids' questions into podcasts

https://wonderpods.app
14•lielvilla•19h ago•10 comments
Open in hackernews

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

https://github.com/moustafa-nasr/fahmatrix
46•mousomashakel•1mo 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•1mo 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•1mo 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•1mo 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•1mo 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•1mo ago
Polars and duckdb interoperate nicely and can enable this flexibility
theanonymousone•1mo ago
Does Polars have a Java library?
mousomashakel•1mo 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•1mo 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•1mo 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•1mo ago
What about Tablesaw, Apache Arrow? How does this compare ...
mousomashakel•1mo 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•1mo ago
Nice!

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

mousomashakel•1mo 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.