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Show HN: Llama 3.1 70B on a single RTX 3090 via NVMe-to-GPU bypassing the CPU

https://github.com/xaskasdf/ntransformer
239•xaskasdf•12h ago•57 comments

Show HN: Minimalist Glitch Art Maker (100% client-side)

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Show HN: Iron-Wolf – Wolfenstein 3D source port in Rust

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Show HN: Fan Meter – A movie quiz game where you guess films from frames

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Show HN: Rust blockchain with sharded propagation and post-quantum signatures

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Show HN: A native macOS client for Hacker News, built with SwiftUI

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251•IronsideXXVI•1d ago•178 comments

Show HN: Trawlx - Tweet text, likes, and retweets as JSON, no API keys

https://github.com/timstarkk/trawlx
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Show HN: Slack as an AI Coding Remote Control

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Show HN: AI writes code – humans fix it

https://humansfix.ai
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Show HN: Nucleus - A Sovereign Control Plane for AI Agents

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Show HN: Ghostty-based terminal with vertical tabs and notifications

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185•lawrencechen•2d ago•75 comments

Show HN: Ghostty and Watercolors

http://jrmeyer.github.io/misc/2026/02/21/ghostty-watercolors.html
4•_josh_meyer_•8h ago•0 comments

Show HN: Mines.fyi – all the mines in the US in a leaflet visualization

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101•irasigman•1d ago•50 comments

Show HN: My Degenerate Craps Simulator

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Show HN: Ktop – a themed terminal monitor for GPU, CPU, RAM, temps and OOM kills

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Show HN: Micasa – track your house from the terminal

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639•cpcloud•2d ago•209 comments

Show HN: Saga – A Jira-like project tracker MCP server for AI agents (SQLite)

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Show HN: A physically-based GPU ray tracer written in Julia

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195•simondanisch•2d ago•92 comments

Show HN: Infinichess – Multiplayer Infinite Chessboard

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Show HN: Dq – pipe-based CLI for querying CSV, JSON, Avro, and Parquet files

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Show HN: Mini-Diarium - An encrypted, local, cross-platform journaling app

https://github.com/fjrevoredo/mini-diarium
131•holyknight•2d ago•63 comments

Show HN: Winslop – De-Slop Windows

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Show HN: MeMCP – MCP for Personal Profile

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Show HN: A small, simple music theory library in C99

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56•lowsun•2d ago•18 comments

Show HN: I scanned 50k radio streams and built an app for the ones that work

https://github.com/meehow/receiver
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Show HN: Nexus – A social platform where your GitHub profile is your identity

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Show HN: Formally Verified a Millennium Prize Problem in Coq Yang-Mills Mass Gap

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https://github.com/yuukiLike/cc-md
3•YuukiJyoudai•12h ago•1 comments

Show HN: Amux – A tmux-based multiplexer for running parallel Claude Code agents

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2•Beefin•12h ago•0 comments

Show HN: Museum of Handwritten Code (If, While, Binary Search, Merge Sort)

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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.