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Show HN: Build your own theme park

https://www.magicpatterns.com/theme-park
40•thealexanderlee•10h ago•18 comments

Show HN: We built the smallest dual-band aircraft tracker

https://pantsforbirds.com/the-worlds-smallest-dual-band-ads-b-receiver-module/
26•CoolNamesAllTkn•6h ago•4 comments

Show HN: Every push-up becomes an attack in a camera-counted RPG game

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20•not_wowinter13•6h ago•6 comments

Show HN: Devx – Autonomous AI coding agent built for Android Termux and desktop

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9•apvcode•7h ago•1 comments

Show HN: Tally – Track campaign donors, promises, and voting records

https://tally-2026.github.io/
2•Somnora•3h ago•1 comments

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

https://tarjan.itch.io/thoreaubasic
154•Gorsefound•3d ago•43 comments

Show HN: LatticeDB – Like SQLite but for graph databases

https://github.com/jeffhajewski/latticedb
179•smiths1999•1d ago•49 comments

Show HN: NetSour, the modular packet analyzer TUI

https://github.com/thegoodduck/NetSour
3•thegoodduck•7h ago•0 comments

Show HN: Buslens – where can I get to by bus? (UK)

https://rupertlinacre.com/buslens/
77•RobinL•20h ago•54 comments

Show HN: TexLite – A lightweight self-hosted LaTeX workspace

https://github.com/SWUFE-DB-Group/TexLite
19•thisispi•12h ago•0 comments

Show HN: Bury.lol – a $2 pixel-art graveyard for things that died

https://bury.lol/
10•alertcubes•12h ago•0 comments

Show HN: Timber (iOS) and Timber Tabs (Mac) – best offline read-aloud LLMs

https://timberreader.com/
9•Fe2_O3•10h ago•1 comments

Show HN: How much of Hacker News is about AI?

https://hnstats.com
68•beekthos•13h ago•46 comments

Show HN: Fab Friends a crowdfunding site for Rwandan college students

https://www.joinfabfriends.org
4•muramira•5h ago•0 comments

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

https://github.com/swimmingbrain/texbrain
117•swimmingbrain•1d ago•27 comments

Show HN: Railo – Deterministic security patch bot using AST and Z3 (no LLMs)

https://www.railo.dev
4•mdzariflatif•9h ago•1 comments

Show HN: Invader – an indie iOS podcast player that never phones home

https://invader.gg/
3•HeadOfProbing•6h ago•3 comments

Show HN: SSH Session Monitor – read-only Windows OpenSSH monitoring

https://github.com/issacnitin/SshSessionMonitor
3•issacnitin•10h ago•0 comments

Show HN: Infra Lang – Compile a Single DSL to K8s, Compose, Helm and Terraform

3•Tuvi•7h ago•0 comments

Show HN: Find Perth jobs. Hire local talent

https://jobsinperth.com.au
2•wowinter15•7h ago•0 comments

Show HN: Prompt Builder – Free Templates

https://www.promptbuilder.space/templates
16•LandoLorinse•13h ago•0 comments

Show HN: Family sync with no server – Apple-signed entitlements on iOS

https://receiptiq.me/blog-family-sync-architecture
4•nichliu•11h ago•0 comments

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3•darkpicnic•7h ago•0 comments

Show HN: Convolens – Real time slides and fact-checking

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3•Banbanaste•7h ago•0 comments

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

https://github.com/leodeim/vpsmon
61•ygagaga•1d ago•17 comments

Show HN: Use GLM-5.3 in Cursor today via tokengo API

https://www.tokengo.com
3•bingus-bongo•8h ago•2 comments

Show HN: Collete-01 - Person in a Model

https://colette.genexperiences.com/
3•quicheshore2003•8h ago•1 comments

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

https://fdeploy.com/
34•dt3ft•1d ago•20 comments

Show HN: Notificator – Send website events to push, email, MQTT and hardware

https://notificator-project.com/get-started/
2•vagelisp•8h ago•1 comments

Show HN: A shop-owner simulator and visual novel set in the early 2000s [video]

https://www.youtube.com/watch?v=o2J_H6metLI
3•hollowlimb•2h 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.