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Show HN: TeXbrain, a LaTeX editor that runs pdfTeX in the browser via WASM

https://github.com/swimmingbrain/texbrain
59•swimmingbrain•5h ago•11 comments

Show HN: LatticeDB – Like SQLite but for graph databases

https://github.com/jeffhajewski/latticedb
120•smiths1999•10h ago•35 comments

Show HN: I made a Raspberry with Qwen my local car AI

https://github.com/ThinkOffApp/CarWatch
113•petruspennanen•11h ago•26 comments

Show HN: Browser automation with no chromedriver and no Node driver

https://github.com/angeldevmobile/Orion
2•usxr1515•30m ago•0 comments

Show HN: I built self-hosted deployment automation tool for Windows and IIS

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25•dt3ft•19h ago•10 comments

Show HN: I wrote a BASIC interpreter that boots on UEFI machines

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127•Gorsefound•2d ago•38 comments

Show HN: Lightweight system monitor for Linux VPS written in Go

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Show HN: Reachpad CLI – Spin up free sandboxes in seconds to develop apps

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Show HN: Use-Fs – A React Hook for the File System Access API and OPFS

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Show HN: A techno machine in one HTML file, with verifiable renders

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228•ssx360•1d ago•46 comments

Show HN: 1 Bit Pixel, pixel art editor with a CRT soul (iPad/Mac)

https://1bitstudio.app/pixel/
4•selimonder•5h ago•1 comments

Show HN: PicoMQ – Durable Streams over HTTP, on object storage

https://picomq.com/
151•adesh_nalpet•1d ago•28 comments

Show HN: Graphlib 3.1 – the C++ 23, header only solution to directional graphs

https://github.com/RANDOMFNP/Graphlib
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Show HN: Ecdeos – P2P Web/Native Distributed OS on Entity Core Protocol

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Show HN: Wireshark in a TUI

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Show HN: GlassBox – what the browser reveals, and how identifiable you are

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Show HN: Sillage a 4 MB memory that lets a frozen language>model remember

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Show HN: MulmoTerminal – Run many Claude Code sessions, see which needs you

https://github.com/receptron/mulmoterminal
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Show HN: A Modern GUI Library for Ada: CSS Styling, XML UI, SDL3

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57•ovenpasta•1d ago•23 comments

Show HN: I missed the moving blocks, so I built a real Linux disk defragmenter

https://github.com/gbin/defragger
2•gbin•8h ago•1 comments

Show HN: Flostep – Diagrams people can actually walk through

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25•pandurang90•1d ago•12 comments

Show HN: Dribbling the AI Watermark Directly In-Prompt

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Show HN: Screen memory without screenshots, just text to Markdown

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61•Dramatize•22h ago•25 comments

Show HN: I built a cybersecurity challenge for university students

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Show HN: Vanilla OS 3 Reunion – Immutable and Reproducible Operating System

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31•NN708•1d ago•13 comments

Show HN: Typeclip – types your clipboard like a human, for screen recordings

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3•izenme•10h ago•0 comments

Show HN: Is this the limit of what a solo founder can build?

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2•truth_behold•10h ago•2 comments

Show HN: Offer discounts and get more visitors

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2•devarifhossain•10h ago•0 comments

Show HN: Player vs. Computer – fight your computer in my web game

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Show HN: JeopardyGithub: GitHub Repo to Jeopardy Game

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3•init0•10h ago•2 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.