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Show HN: Guitoro, a virtual guitar you strum with your keyboard

https://guitoro.com/
431•talccc•14h ago•110 comments

Show HN: How random are you?

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147•vunderba•16h ago•75 comments

Show HN: Chiplab - Give your AI agent access to virtual hardware

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Show HN: XY Music Notation

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72•jmole•15h ago•62 comments

Show HN: Parsimony – an open-source benchmark for how much code AI models add

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69•lasu•13h ago•13 comments

Show HN: I built a tool to track what AI leaders say and how their views change

https://blumify.io/people
100•gcsydney•8h ago•61 comments

Show HN: Spotatui, a Spotify TUI/GUI without web API rate limits

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75•LargeModGames•22h ago•14 comments

Show HN: Use your OpenAI subscription to create audiobooks

https://pdftomp3.com/connect-ai/
162•janpmz•23h ago•84 comments

Show HN: Jevcrawl – A web crawler for AI agents with no LLM in the crawl loop

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12•rayenmlayeh•10h ago•1 comments

Show HN: Pulse Local, a Mac budgeting app whose AI models run on your machine

https://pulseos.finance
105•niztk•10h ago•68 comments

Show HN: Mosh-rs, Mosh rewritten in Rust with scrollback and Windows support

https://github.com/Arunjay4213/mosh-rs
18•Arunjay__•9h ago•6 comments

Show HN: Geometry Check, a Fusion 360 add-in that finds slightly-wrong geometry

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Show HN: SuperLocalMemory" AI brain that never bluffs: Laya, Jev, Google Gemma

https://github.com/qualixar/superlocalmemory
4•vpbhardwaj•4h ago•0 comments

Show HN: SolidCraft – Open-Source Parametric CAD in Rust (With MCP Support)

https://github.com/bherbruck/solidcraft
135•bherbruck•1d ago•50 comments

Show HN: Stream live open data in two commands

https://docs.hypermass.io/docs/cli/
15•gardensalad•20h ago•1 comments

Show HN: AgentGate – Fast authorization gateway for AI agent tools

https://github.com/mohitdebian/AgentGate
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Show HN: Wonderhop – A daily game: guess what most people say, or what none do

https://wonderhop.io/en/
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Show HN: Yagi DSP Modulation SIM

https://brian-armstrong.github.io/yagi/lab.html
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Show HN: Atticus – Hold-to-talk voice assistant for macOS that runs on Claude -p

https://github.com/SaarthurR/atticus-mac
114•SaarthRanka•2d ago•28 comments

Show HN: An experimental pattern-first DAW that supports MCP

https://github.com/andrewfader/blokkily
83•androsynth89•1d ago•39 comments

Show HN: GenClass, A 10 MB in-browser model that catches bugs that never throw

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Show HN: Deslop – Oxlint rules for AI-generated TypeScript

https://github.com/maharshi365/deslop
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Show HN: Knitting – A shared-memory concurrency runtime for Node.js,Bun,and Deno

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Show HN: Brutus CLI – Tiny Dagger to Kill Your Mac's Caesar

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Show HN: Sayso, free open source dictation for Mac, Windows, and Linux

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20•watzon•17h ago•8 comments

Show HN: Can AI read your mind?

https://jeffyclassify.com/blog/mind-reader/
6•nico•7h ago•8 comments

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https://github.com/Gen-Verse/RSI-Anything
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https://aihub.remakelearning.org/
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Show HN: Brickbrag – A multiplayer brick-building world in the browser

https://brickbrag.com/
76•neuling•1d ago•40 comments

Show HN: The LAST DOOR – a tiny game about deciding when to leave

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5•sydro9•8h ago•0 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.