frontpage.
newsnewestaskshowjobs

Open Source @Github

fp.

Show HN: OzBrain, a shared brain for knowledge between agents and your team

https://ozbrain.com
16•dariusmonsef•1h ago•5 comments

Show HN: Shoehorn – Quantize any model down to run on your machine

https://notactuallytreyanastasio.github.io/shoehorn/
77•rhgraysonii•3d ago•17 comments

Show HN: Proliferate- open-source, self-hostable Codex for any coding agent

https://github.com/proliferate-ai/proliferate
36•pablo24602•7h ago•14 comments

Show HN: Declarative-forms – await an object the way prompt() awaits a string

https://wolfoo2931.github.io/declarative-forms/
12•WolfOliver•6h ago•1 comments

Show HN: Oasis - Giving Agents Situational Awareness

https://joinoasis.com
6•ns90001•6h ago•2 comments

Show HN: Public Muscriptor Instance (latest, most powerful Audio-to-MIDI model)

https://www.pianoify.net/
8•jardy•8h ago•0 comments

Show HN: Huzzah – a novel approach to coding with AI

https://www.danielvaughn.dev/posts/huzzah/
359•danielvaughn•1d ago•206 comments

Show HN: Zroar – Serialized Roaring Bitmaps in Zig

https://github.com/manishrjain/zroar
3•mrjn•3h ago•0 comments

Show HN: I trained a 125M model to autocomplete piano on-device

https://simedw.com/2026/08/20/midi-autocomplete/
575•simedw•1d ago•113 comments

Show HN: Open-source Stripe Connect alternative

https://zoneless.com
80•tinyprojects•1d ago•35 comments

Show HN: CSVtoTable – turn a CSV/XLSX into one self-contained HTML file

https://github.com/vividvilla/csvtotable
5•v512•5h ago•1 comments

Show HN: Gramola, a CoverFlow-style music dock for macOS

https://apps.apple.com/us/app/gramola-music-dock/id6801078031?mt=12
6•fulltimefeline•8h ago•2 comments

Show HN: Traccia - Observability, Runtime Control & Audit for agents

https://traccia.ai/
2•vijaypoudel•5h ago•0 comments

Show HN: SteppeWM – a stacking IceWM-like Wayland compositor

https://github.com/uncognic/steppewm
8•uncognic•8h ago•6 comments

Show HN: Interactive map of the Odyssey with tap-to-gloss Homeric Greek

https://georgemasto.com/odyssey/
7•bohnohboh•6h ago•3 comments

Show HN: Check if any of the $656M in unclaimed royalties at The MLC is yours

https://pub.doub.ly/
75•knaught•1d ago•37 comments

Show HN: CLI to Churn Out CLIs

https://github.com/chinmayrelkar/bawarchi
3•Chnmy•9h ago•0 comments

Show HN: All your saved articles in one place

https://www.topicsapp.net
3•starlightttt•6h ago•0 comments

SHOW HN: WillItSpam – paste an email, see why it will land in spam

https://willitspam.com
3•vladimir-aleksi•10h ago•0 comments

Show HN: Visual way to understand things in parallel

https://wondering.app/canvas
7•ak2411•7h ago•4 comments

Show HN: A puzzle I couldn't solve for a year – cubers cracked it in an hour

https://skimmiq.com/pt/
4•Pawel_SkimmIQ•7h ago•1 comments

Show HN: Steganeur – Hide secret messages in LLM-generated text (Rust)

https://github.com/marcsnid/steganeur
3•marcsnid•7h ago•0 comments

Show HN: eInk Optimized Manga with Kindle Comic Converter (+Kobo/KOreader)

https://github.com/ciromattia/kcc
2•seam_carver•7h ago•0 comments

Show HN: Roastme.gg – Pay to get publicly roasted by AI

https://roastme.gg
2•alexcloudstar•7h ago•0 comments

Show HN: Caspian – Talk to Human Tool for AI Agents

https://github.com/TryCaspian/caspian-sdk
5•dipanshuhappy•7h ago•0 comments

Show HN: Mini DBA – monitoring for on prem and cloud databases in 1 place

https://demo.minidba.com/kiosk-human-check?returnUrl=%2F
2•badlydressedboy•8h ago•0 comments

Show HN: A simple budget app focused on how much you can spend each day

https://www.coinsbucket.com/
3•vitormargis•11h ago•0 comments

Show HN: Whodunit? Solve a daily AI-written Mystery

https://whodunit.rip
2•selljamhere•8h ago•0 comments

Show HN: Free, non-profit crypto AML screening – no key, no trial

https://publicaml.org/free-crypto-aml/
5•publicaml•12h ago•0 comments

Show HN: Telex Page – Turn secrets into AES 256 encrypted PDFs, locally

https://telexpage.com/
3•cucho•8h 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.
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.