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Show HN: OneCLI – Vault for AI Agents in Rust

https://github.com/onecli/onecli
109•guyb3•6h ago•37 comments

Show HN: Detect any object in satellite imagery using a text prompt

https://www.useful-ai-tools.com/tools/satellite-analysis-demo/
8•eyasu6464•4d ago•1 comments

Show HN: Axe – A 12MB binary that replaces your AI framework

https://github.com/jrswab/axe
130•jrswab•9h ago•90 comments

Show HN: Understudy – Teach a desktop agent by demonstrating a task once

https://github.com/understudy-ai/understudy
73•bayes-song•6h ago•19 comments

Show HN: OpenClaw-class agents on ESP32 (and the IDE that makes it possible)

https://pycoclaw.com/
7•pycoclaw•1h ago•1 comments

Show HN: Rudel – Claude Code Session Analytics

https://github.com/obsessiondb/rudel
121•keks0r•9h ago•72 comments

Show HN: Web-based ANSI art viewer

https://sure.is/ansi/
23•lubujackson•2d ago•7 comments

Show HN: Stratum – SQL that branches and beats DuckDB on 35/46 1T benchmarks

https://datahike.io/notes/stratum-analytics-engine/
5•whilo•1h ago•3 comments

Show HN: Codelegate, keyboard-driven coding agent orchestrator GUI for Mac/Linux

https://codelegate.dev/
3•brucehsu•2h ago•0 comments

Show HN: Every Developer in the World, Ranked

https://coderank.me
8•ejc•2h ago•4 comments

Show HN: s@: decentralized social networking over static sites

http://satproto.org/
393•remywang•22h ago•204 comments

Show HN: An application stack Claude coded directly in LLVM IR

https://github.com/dot-matrix-labs/alien-stack
6•dboreham•5h ago•0 comments

Show HN: Slop or not – can you tell AI writing from human in everyday contexts?

https://slop-or-not.space
5•eigen-vector•1h ago•7 comments

Show HN: PipeStep – Step-through debugger for GitHub Actions workflows

https://github.com/Photobombastic/pipestep
7•photobombastic•5h ago•3 comments

Show HN: Cloud to Desktop in the Fastest Way

https://nativedesktop.com/
3•lasgawe•5h ago•1 comments

Show HN: Open-source browser for AI agents

https://github.com/theredsix/agent-browser-protocol
142•theredsix•1d ago•52 comments

Show HN: Raccoon AI – Collaborative AI Agent for Anything

https://raccoonai.tech
3•scorchy38•4h ago•1 comments

Show HN: I built a tool that watches webpages and exposes changes as RSS

https://sitespy.app
305•vkuprin•1d ago•79 comments

Show HN: Autoresearch@home

https://www.ensue-network.ai/autoresearch
74•austinbaggio•23h ago•19 comments

Show HN: VaultLeap – USD accounts for founders outside the US

https://vaultleap.com
4•GregReve•7h ago•2 comments

Show HN: Baltic security monitor from public data sources

https://estwarden.eu/
4•makefunstuff•5h ago•0 comments

Show HN: A desktop app for managing Claude Code sessions

https://github.com/doctly/switchboard
4•kapitalx•8h ago•1 comments

Show HN: Vanilla JavaScript refinery simulator built to explain job to my kids

https://fuelingcuriosity.com/game.html
118•fuelingcurious•1d ago•46 comments

Show HN: Hyper – Voice Notes for Whiteboarding Sessions

https://apps.apple.com/us/app/hyper-ai-for-real-talk/id6760206718
3•kthaker1224•5h ago•0 comments

Show HN: A context-aware permission guard for Claude Code

https://github.com/manuelschipper/nah/
120•schipperai•23h ago•83 comments

Show HN: Verge Browser a self-hosted isolated browser sandbox for AI agents

https://github.com/zzzgydi/verge-browser
3•zzzgydi•6h ago•0 comments

Show HN: XLA-based array computing framework for R

https://github.com/r-xla/anvil
12•sebffischer•3d ago•1 comments

Show HN: I built an ISP infrastructure emulator from scratch with a custom vBNG

https://aether.saphal.me/dashboard/default
64•saphalpdyl•1d ago•19 comments

Show HN: Satellite imagery object detection using text prompts

https://www.useful-ai-tools.com/tools/satellite-analysis-demo/
51•eyasu6464•3d ago•22 comments

Show HN: Klaus – OpenClaw on a VM, batteries included

https://klausai.com/
154•robthompson2018•1d ago•90 comments
Open in hackernews

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

https://github.com/moustafa-nasr/fahmatrix
46•mousomashakel•9mo 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•9mo 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•9mo 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•9mo 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•9mo 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•9mo ago
Polars and duckdb interoperate nicely and can enable this flexibility
theanonymousone•9mo ago
Does Polars have a Java library?
mousomashakel•9mo 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•9mo 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•9mo 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•9mo ago
What about Tablesaw, Apache Arrow? How does this compare ...
mousomashakel•9mo 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•9mo ago
Nice!

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

mousomashakel•9mo 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.