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Show HN: An e-ink frame that hears birds and draws them as 1800s illustrations

https://github.com/arnegiacomo/fugleramme
1172•arnemunthekaas•10h ago•158 comments

Show HN: Capsule – Single-file web apps that save their data into SQLite

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255•bashtian•9h ago•112 comments

Show HN: Hacking a $20 4G wireless hotspot into a texting device

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159•bobili1234•9h ago•30 comments

Show HN: Pizza Bot – An inbox for AI agents that work in the background

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Show HN: DeadLock OS – A Linux terminal puzzle game

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Show HN: HonestSky, a free iOS weather app without ads or subscriptions

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Show HN: Panel – A research workspace where the agent can build its own panes

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Show HN: Check if your IP has appeared in a residential proxy network

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Show HN: Ordewell – turn one goal into an ordered plan of coding-agent tasks

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Show HN: Redis City – Explore how Redis works in an interactive 3D model

https://poltora.dev/redis
162•poltora•3d ago•25 comments

Show HN: Loss. a tiny satire about AI progress

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28•pbobak•8h ago•7 comments

Show HN: SCIP MIP solver bindings for Go, ported from russcip

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Show HN: farseer.space – fly anywhere in the universe in your browser

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Show HN: Sass – Rust and WASM

https://github.com/zoosky/accent-sass
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Show HN: DaiDocs, AI memory as a plain-text file format, not a service

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Show HN: Macros with a Behringer FCB1010 MIDI Pedalboard in macOS

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Show HN: Kinesis – Control your Mac with the Meta Neural Band

https://github.com/callbacked/kinesis
119•callbacked•1d ago•45 comments

Show HN: Warp – Run DeepSeek v4.1 Flash with 5 GB of RAM at 3.77 tok/s

https://github.com/sqliteai/warp
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Show HN: Open-source passive NFC tag that signs with ECDSA, verified on-chain

https://github.com/mwbpNFTechnology/toluTag/
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Show HN: Pelican-bicycle alternatives

https://gally.net/temp/20260914pelican-alternatives/index.html
128•tkgally•1d ago•45 comments

Show HN: Nari Qwen3-TTS and Qwen3-ASR – High accuracy, low latency and cost

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89•toebee•1d ago•31 comments

Show HN: AirmailAI, a BYOK LLM chat app with a browser extension backend

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Show HN: Let agent read files with secrets while redacting values for LLM contex

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Show HN: Omni – Open-source workplace agent, built on Postgres

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Show HN: TabPFN-3.5, a Tabular Foundation Model for messy real-world tables

https://priorlabs.ai/technical-reports/tabpfn-3-5
9•onasta•5h ago•1 comments

Show HN: I ported COLMAP (photogrammetry) to the browser in WASM and WebGPU

https://offlinetools.io/colmap-landing/
2•rsp1984•6h ago•0 comments

Show HN: I built a tiny camera that knows where it is

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4•asadm•9h ago•4 comments

Show HN: Extract original images from a PDF in the browser

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4•theholygrail•6h ago•0 comments

Show HN: An open source safety layer for AI agent actions

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4•arpanghoshal•6h ago•1 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.