frontpage.
newsnewestaskshowjobs

Open Source @Github

fp.

Show HN: Qwen3-4B with the AI writing tics trained out

https://100toolkit.com/blog/deslop-model/
59•erikkannike•1h ago•27 comments

Show HN: KiviDB, a faster Redis-compatible memory database and vector cache

https://github.com/kividbio/kividb
2•murtazayusuf•26m ago•1 comments

Show HN: Semantics to SQL in Rust, ~70µs per query

https://github.com/stratasite/0sql
3•allenjiji•50m ago•0 comments

Show HN: I built a task system to handle the drudgery so I could focus on tasks

https://3anddoneapp.com/try
2•dmayle•1h ago•3 comments

Show HN: WhatsApp MCP running free on Cloudflare

https://github.com/finereli/whatsapp-mcp
133•zoozla•16h ago•70 comments

Show HN: Ranet3 – High performance policy routed IPsec mesh SD-WAN

https://ranet3.com/
36•StepBroBD•23h ago•11 comments

Show HN: A biotech catalyst calendar that links every date to the SEC sentence

https://www.orionbiotechai.com/
4•orionbiotech•2h ago•0 comments

Show HN: The Zelda timeline to catch up before the Ocarina of Time remake

https://legendofhyrule.com/
202•jsomau•1d ago•118 comments

Show HN: High-quality duck audio synthesizer

https://celphase.github.io/duck-pond/
172•celphase•2d ago•44 comments

Show HN: Sphinx – A hook that quizzes you on your AI's code before shipping

https://sphinx-six-theta.vercel.app/
248•critiquebrowser•1d ago•87 comments

Show HN: Esp32sim – Run ESP32 firmware in the browser

https://github.com/mikroverk/esp32sim
197•joakimeriksson•2d ago•45 comments

Show HN: 500 clocks in one 6.3 MB HTML file by Opus 5.5

https://tkgally.github.io/500-clocks/
72•tkgally•1d ago•28 comments

Show HN: Yila – A Codex for Scientific Research

https://yila.ai
8•blacktechnology•9h ago•4 comments

Show HN: OmniPTY – Opinionated terminal emulator for macOS and Linux

https://github.com/omnipty-terminal/omnipty
14•bobbycoleman-de•16h ago•3 comments

Show HN: Parin – A 2D game engine between raylib and Godot, written in Dlang

https://github.com/Kapendev/parin
73•Kapendev•3d ago•19 comments

Show HN: The Lion King (SNES, 1994), running as a native PC program

https://github.com/kinduff/TLKRecomp
6•kinduff•8h ago•2 comments

Show HN: Roadkill – a zombie car game inspired by the original GTA's driving

https://games.zabaca.com/games/roadkill/
7•uptownhr•9h ago•2 comments

Show HN: Llmspeed – feel how fast a local LLM runs before you buy the hardware

https://llmspeed.dev/
326•albinstman•2d ago•86 comments

Show HN: Trmnl-cards – Turn an XTEINK X4 into a tiny frame for rare cards

https://github.com/mdnahian/trmnl-cards
3•mdni007•9h ago•0 comments

Show HN: Things to Do API

https://thingstodoapi.com/
55•invalidmonk•2d ago•29 comments

Show HN: Gemini 4 Argon plays StarCraft

https://starskirmish.com/bench/v0-2/
249•__cayenne__•3d ago•111 comments

Show HN: Wonderhop – A daily game: guess what most people say, or what none do

https://wonderhop.io/en/
119•mtlduo•5d ago•95 comments

Show HN: CallSitter – bot that answers my calls and wastes scammers' time

https://github.com/szerintedmi/callsitter
13•szert•1d ago•10 comments

Show HN: Pi-cowboy – use Codex, Claude Code, OpenCode as subagents

https://github.com/electric-dragon-80000v/pi-cowboy
6•suoloordi•22h ago•2 comments

Show HN: Neuron, agents that set themselves up from your GitHub repo

https://www.neuronbot.in
2•tanay_kapoor•11h ago•0 comments

Show HN: My Personal Weather Station

https://johnzanussi.com/weather
5•johnz•11h ago•1 comments

Show HN: Flipflop – Iroh-powered persistent tunnels for filesharing

https://github.com/andunieee/flipflop
146•andunie•4d ago•71 comments

Show HN: DocuMemory – Persistent memory and context for AI coding tools

https://www.documemory.dev/
4•veryslowcode•23h ago•0 comments

Show HN: Hybro – an open interoperability engine for AI agents

https://github.com/hybroai/hybro
2•kevinlu310•14h ago•0 comments

Show HN: InfiniDomino – practically infinite world of dominoes to knock over

https://infinidomino.io/
2•Static2280•14h 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.