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Show HN: A tool to manage a swarm of coding agents on Linux

https://github.com/penberg/swarm
4•penberg•1h ago•1 comments

Show HN: I built a Cargo-like build tool for C/C++

https://github.com/randerson112/craft
149•randerson_112•17h ago•136 comments

Show HN: Hindsight Simulator – Go back in time and get rich

https://chrispattle.com/hindsight-simulator
3•pattle•27m ago•0 comments

Show HN: A security scanner for AI Agent Skills

https://github.com/Fangcun-AI/SkillWard/tree/main
4•mayziem•1h ago•0 comments

Show HN: Druids – Build your own software factory

https://github.com/fulcrumresearch/druids
52•etherio•1d ago•11 comments

Show HN: Run GUIs as Scripts

https://github.com/skinnyjames/hokusai-pocket
2•zero-st4rs•2h ago•0 comments

Show HN: Rust based eBook library for Python, with MIT license

https://github.com/arc53/fast-ebook
23•larry-the-agent•11h ago•2 comments

Show HN: CSS Studio. Design by hand, code by agent

https://cssstudio.ai
153•SirHound•22h ago•95 comments

Show HN: Moon simulator game, ray-casting

https://mooncraft2000.com
105•JKCalhoun•3d ago•24 comments

Show HN: Guruka.com – free guided mediations. No signup, private, works offline

https://guruka.com/
25•eummm•19h ago•8 comments

Show HN: Linear RNN/Reservoir hybrid generative model, one C file (no deps.)

https://raw.githubusercontent.com/bggb7781-collab/lrnnsmdds/refs/heads/main/lrnnsmdds
7•adinhitlore•11h ago•2 comments

Show HN: 41 years sea surface temperature anomalies

https://ssta.willhelps.org
143•willmeyers•21h ago•65 comments

Show HN: Orange Juice – Small UX improvements that make HN easier to read

http://oj-hn.com/
138•latchkey•1d ago•155 comments

Show HN: Mdpdf a 2k line C CLI to convert Markdown to tiny PDFs

https://github.com/schicho/mdpdf
8•bastscho•17h ago•3 comments

Show HN: A (marginally) useful x86-64 ELF executable in 301 bytes

https://github.com/meribold/btry
62•meribold•3d ago•19 comments

Show HN: Is Hormuz open yet?

https://www.ishormuzopenyet.com/
457•anonfunction•1d ago•202 comments

Show HN: Unicode Steganography

https://steganography.patrickvuscan.com
55•PatrickVuscan•2d ago•13 comments

Show HN: I pipe free sports streams into Jellyfin – no ads, just HLS

https://github.com/pcruz1905/hls-restream-proxy
114•pruz•1d ago•35 comments

Show HN: Go-Bt: Minimalist Behavior Trees for Go

https://github.com/rvitorper/go-bt
61•rvitorper•1d ago•12 comments

Show HN: We built a camera only robot vacuum for less than $300 (well almost)

https://indraneelpatil.github.io/blog/2026/robot-vacuum/
106•indraneelpatil•4d ago•55 comments

Show HN: Brutalist Concrete Laptop Stand (2024)

https://sam-burns.com/posts/concrete-laptop-stand/
782•sam-bee•2d ago•235 comments

Show HN: TUI-use: Let AI agents control interactive terminal programs

https://github.com/onesuper/tui-use
52•dreamsome•1d ago•37 comments

Show HN: I built a navigation app that displays weather along the route

https://navimodo.com/
55•vkatluri•3d ago•25 comments

Show HN: Skrun – Deploy any agent skill as an API

https://github.com/skrun-dev/skrun
59•frizull•1d ago•11 comments

Show HN: SmolVM – open-source sandbox for coding and computer-use agents

https://github.com/CelestoAI/SmolVM
6•theaniketmaurya•9h ago•1 comments

Show HN: I made a skill to tell AI on how to use human as Dobby

https://github.com/LittleLittleCloud/Dobby
4•BigBigMiao•10h ago•0 comments

Show HN: Zoneless – Open-source Stripe Connect clone with $0.002 fees using USDC

https://github.com/zonelessdev/zoneless
14•tinyprojects•19h ago•6 comments

Show HN: Memoriki – LLM Wiki+MemPalace for persistent personal knowledge bases

5•Aianback•11h ago•0 comments

Show HN: Agent Tuning, using recursion to achieve predictable agent output

https://github.com/adam-s/agent-tuning
5•dataviz1000•11h ago•0 comments

Show HN: An interactive map of Tolkien's Middle-earth

https://middle-earth-interactive-map.web.app/
287•frasermarlow•2d ago•69 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.