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Show HN: FFmpeg WebCLI – Full FFmpeg in Browser, Offline PWA, No Uploads(WASM)

https://github.com/tejaswigowda/ffmpeg-webCLI
50•tejaswigowda•2h ago•13 comments

Show HN: Hitoku Draft – Context aware local assistant

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Show HN: Formally verified polygon intersection – Opus 4.8 oneshots, prev failed

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28•permute•55m ago•3 comments

Show HN: Mercek – A Desktop IDE for AWS ECS

https://www.mercek.dev/
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Show HN: Uruky (EU-based Kagi alternative) now has Image Search and URL Rewrites

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200•BrunoBernardino•14h ago•188 comments

Show HN: Cost.dev (YC W21) – making agents cost-aware and cheaper to call

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Show HN: Prela – Purely Algebraic Relation Combinators

https://github.com/remysucre/prela
59•remywang•3d ago•13 comments

Show HN: NoiR Code – because QR sounds similar to "noir"

https://noir-code.suncake.xyz/
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Show HN: Using Haskell to play music on 3D printer motors (2020)

https://lucasoshiro.github.io/software-en/2020-07-31-music_gcode/
5•lucasoshiro•2h ago•0 comments

Show HN: Boxes.dev: ditch localhost; run Claude Code and Codex in the cloud

https://boxes.dev
80•nab•8h ago•58 comments

Show HN: Bot or Not – Spot AI-generated randomness

https://play-bot-or-not.vercel.app/
3•EvanZhouDev•3h ago•0 comments

Show HN: Edsger – A handwritten Clojure REPL for the reMarkable 2

https://handwritten.danieljanus.pl/2026-06-01-edsger.html
253•nathell•2d ago•34 comments

Show HN: Digger Solo – Local AI File Explorer

https://solo.digger.lol
3•sean_pedersen•3h ago•0 comments

Show HN: I reverse-engineered the world maps of Test Drive III (1990 DOS game)

https://github.com/s-macke/Test-Drive-3-Maps
213•s-macke•4d ago•55 comments

Show HN: Wallflower.app – A Combined Mastodon and Bluesky Client

https://thewallflower.app
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Show HN: Nutrepedia – Nutrition info in 29 locales built with Clojure and Htmx

https://nutrepedia.com/en-us/
128•llovan•1d ago•28 comments

Show HN: Mnemo – local-first AI memory layer for any LLM (Rust, SQLite,petgraph)

https://github.com/zaydmulani09/mnemo
54•zaydmulani•1d ago•25 comments

Show HN: Eyeball

https://eyeball.rory.codes/
287•mrroryflint•2d ago•86 comments

Show HN: Bit-banged 10BASE-T Ethernet and Wi-Fi router in Rust on the Pico 2 W

https://github.com/mattdeeds/pico-10base-t-rs
5•mdeeds•7h ago•0 comments

Show HN: AgentKitten: Swift package for provider-agnostic AI agents

https://github.com/fbeeper/agentkitten
10•fbeeper•8h ago•1 comments

Show HN: Bio Glyph – Turn Your Face into a One-Line Drawing

https://bio.bairui.dev/
19•subairui•22h ago•13 comments

Show HN: ClearLogo – a logo API that returns usable logos, not raw files

https://clearlogo.dev/en
6•ehalim•8h ago•2 comments

Show HN: Rscrypto, pure-Rust crypto with industry leading public benches

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32•LoadingALIAS•1d ago•14 comments

Show HN: Ideogram 4.0 – open-weight 9.3B text-to-image model

https://github.com/ideogram-oss/ideogram4
44•pigcat•1d ago•10 comments

Show HN: Live breath detection and biofeedback from a phone microphone

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63•felixzeller•2d ago•25 comments

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Show HN: Lint Your Markdown with ESLint

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14•beenzinozino•1d ago•3 comments

Show HN: RePlaya – self-hosted browser session replay with live tailing

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50•shikhar•2d ago•8 comments

Show HN: Tired of duct-taping access control into agent prompts. Here's the fix

https://github.com/yaodub/cast
22•zwigglers•1d ago•21 comments

Show HN: Chatcode – Remote Control for Claude Code and Codex

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9•borkasm•12h ago•14 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.