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Show HN: Homegames. An open-source game platform I've been making for 8 years

https://homegames.io
182•homegamesjoseph•12h ago•43 comments

Show HN: Visualize Model Spikiness in 3D

https://www.modelmap.tech/
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Show HN: Osint tool that finds exposed files on domains

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40•PatchRequest•13h ago•15 comments

Show HN: I hated how much my 12-year-old played Roblox, so we built our own FPS

https://cooked.house
21•davitb•16h ago•4 comments

Show HN: Open Science, open-source alternative to Claude Science

https://github.com/ai4s-research/open-science
6•aiboost•4h ago•2 comments

Show HN: I made the Chrome Dino Game editable by your AI prompts

https://vibedino.com
2•johnnyapple•4h ago•0 comments

Show HN: KiCad in the Browser

https://demo.pcbjam.com/
101•ViktorEE•21h ago•32 comments

Show HN: Peek-CLI: Let Claude Code See the Browser

https://github.com/puffinsoft/peek-cli
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Show HN: A bedside camera detects REM sleep and agrees with a clinical EEG

https://lucidcode.com/2026/06/20/inspec-with-cgx-patch-clinical-eeg-sleep-stage-classification/
6•MichaelCoder•13h ago•0 comments

Show HN: A faithful MUMPS 76 anniversary implementation – the original NoSQL DB

https://github.com/rochus-keller/mumps/
2•Rochus•8h ago•1 comments

Show HN: Bramble – Local-first password manager

https://github.com/flythenimbus/bramble
144•MegagramEnjoyer•3d ago•45 comments

Show HN: An unmetered LLM API–$6/month, no token tracking, no limits

https://yolo-auto.com/
5•yolo-auto•8h ago•1 comments

Show HN: Meon – declarative flat-parsing engine (SoA, no AST)

https://github.com/vgnapuga/meon
6•vgnapuga•16h ago•1 comments

Show HN: Sidenote – comment on your rendered blog, an LLM writes the Git diff

https://github.com/bharadwaj-pendyala/sidenote
9•bharadwajp•13h ago•0 comments

Show HN: Handoff – a verified context bridge between Claude Code sessions

https://github.com/ostikwhy-blip/claude-code-handoff-skill
7•ostik•16h ago•2 comments

Show HN: AI-related Jax module (I hate if)

https://github.com/PJHkorea/egregore-core-jax
3•PJHkorea•9h ago•5 comments

Show HN: AI integrated in any terminal that's invisible until you need it

https://terminai.app
4•emosenkis•10h ago•0 comments

Show HN: Three small browser primitives – identity, handoff, durable local

https://oss.sarwagya.wtf
2•0xsarwagya•10h ago•0 comments

Show HN: Sun light and path calculation for photography

https://www.lightwindow.app
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Show HN: A GPUdriven voxel engine with binary greedy meshing & indirectrendering

https://github.com/omar-owis/VoxelEngine
3•Iwho•15h ago•1 comments

Show HN: Logo Design for Busy Founders

https://iconicity.cc
3•sim04ful•11h ago•2 comments

Show HN: Tracking how much of the HN front page is AI-generated

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Show HN: Code-Manager

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Show HN: Thunderstorm tracker for Mexico England world cup game

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Show HN: clip.video - Turn podcasts and long videos into short vertical clips

https://clip.video/
2•nadermx•13h ago•2 comments

Show HN: Small World – The "Preact" of 3D Web Engines (TypeScript, WebGPU)

https://rottensteiner-stefan.github.io/small-world/
7•DragonZoul•19h ago•2 comments

Show HN: Social and context-aware AI platform to do math

https://www.prooftree.ai
5•lemma1729•13h ago•1 comments

Show HN: A pipeline that writes courses and adversarially reviews them

https://purrlearn.com
4•nirolee•20h ago•0 comments

Show HN: Classify mechanical faults using Contrastive Language-Audio Pretraining

https://github.com/adam-s/car-diagnosis
35•dataviz1000•4d ago•3 comments

Show HN: A statically typed, cross-platform, easily bootstrappable build system

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46•Rochus•5d ago•15 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.