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Show HN: LaunchPact – get upvotes for your ProductHunt launch

https://www.launchpact.io
2•devtanna•20m ago•0 comments

Show HN: Open-Source AI Racing Harness

https://www.elodin.systems/post/elodin-ai-grand-prix-race-sim-harness
34•danAtElodin•11h ago•4 comments

Show HN: Open-source Workspace (mail,docs,spreadsheet,drive) web/iOS

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88•nathanstitt•17h ago•33 comments

Show HN: I made an emergency page for my family

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69•delduca•17h ago•94 comments

Show HN: Teleport-env – <500ms stateful rollbacks for AI agents via CRIU

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3•Jainish08•6h ago•0 comments

Show HN: Posthorn, self-hosted mail gateway

https://github.com/craigmccaskill/posthorn
74•craigmccaskill•1d ago•54 comments

Show HN: An update to our long-turn FreeCiv experience

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4•verelo•7h ago•0 comments

Show HN: A website that tracks every stock trade Congress makes

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56•hubraumhugo•1d ago•20 comments

Show HN: Filemat – an open-source web-based file manager

https://github.com/bingud/filemat
16•bingud•17h ago•12 comments

Show HN: CSP Radar – Build a Content Security Policy without breaking your site

https://cspradar.com
2•itsdevdaniel•11h ago•0 comments

Show HN: Sweetpad – VS Code extension for building iOS/Swift apps

https://github.com/sweetpad-dev/sweetpad
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Show HN: Iron – A Programmable Compiler that can convert 6.3M LOC/s

https://github.com/dogmaticdev/IRON
4•dogmaticdev•11h ago•0 comments

Show HN: VAEN – Package and import portable AI coding-agent Harnesses

https://github.com/sjhalani7/vaen
7•sjhalani7•11h ago•3 comments

Show HN: OpenBrief – Local-first video downloader/summarizer

https://github.com/tantara/openbrief
90•tantara•2d ago•17 comments

Show HN: Open-source alternative to Duolingo for learning anything

https://www.zoonk.com/
5•ceolin•11h ago•0 comments

Show HN: Audiomass – a free, open-source multitrack audio editor for the web

https://audiomass.co/?multitrack=1
544•pantelisk•3d ago•119 comments

Show HN: Game Boy pixel pipeline explorer

https://pixelpipeline.xyz
10•blueblazin•19h ago•2 comments

Show HN: Rapel – chunked resumable downloads in unstable networks

https://github.com/redraw/rapel
18•autorun•2d ago•9 comments

Show HN: Geomatic – A command-driven geometry studio enabled with autodiff

https://www.tinyvolt.com/geomatic
73•nivter•2d ago•17 comments

Show HN: Claude Code's $200 plan is a 17× subsidy on the raw API

https://github.com/Coral-Bricks-AI/coral-ai/tree/main/claude-code-token-xray
8•Hiteshjain118•14h ago•14 comments

Show HN: OAuth 2.0 framework for MCP servers

https://github.com/brooksmcmillin/mcp-authflow
2•bengal•15h ago•0 comments

Show HN: Hodor – a 701KB native macOS prompt launcher for AI tools

https://hodor.design
4•woodydesign•15h ago•0 comments

Show HN: Demon – open-source real-time music diffusion engine, 25Hz local GPU

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15•ryanontheinside•15h ago•11 comments

Show HN: Gochan – A library of channel architectures for Go, inspired by Rust

https://github.com/amorey/gochan
4•andres•16h ago•0 comments

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https://github.com/bitcreed/gsd-meta-manager/
9•_blk•1d ago•1 comments

Show HN: Enigma – a walkthrough from Caesar ciphers to a working Enigma machine

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27•tomfunk•2d ago•13 comments

Show HN: skills-for-humanity – 171 structured reasoning skills for Claude Code

https://github.com/human-avatar/skills-for-humanity
26•finnworks•2d ago•5 comments

Show HN: Cross-agent messaging and shared memory over the local filesystem

https://oacp.dev
11•haoranchg•1d ago•6 comments

Show HN: Map drawing tool where the map lives in the URL

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6•singiamtel•19h 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.
theanonymousone
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.
•
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.