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Show HN: A 15 MB self-hosted Netflix and Spotify for your media server

https://github.com/HolyArrs/HolyArrs
73•CoderLuii•2h ago•44 comments

Show HN: Ghanaian street games you can play in the browser

https://www.ghanastreetgames.com/
38•samuelaidoo45•1d ago•7 comments

Show HN: Every satellite that passed over any place this week, and its photos

https://www.watched.earth
412•a585gupt•20h ago•77 comments

Show HN: Markview – a fast Markdown reader in Rust, Obsidian Vault compatible

https://github.com/szdytom/markview
2•szdytom•1h ago•2 comments

Show HN: Wanim – Run Manim Python in the browser, 20× smaller than Pyodide

https://github.com/Acfboy/Wanim
3•Acfboy•1h ago•2 comments

Show HN: MeowDisplay Is iPhone Mirroring, but in Reverse

https://meowdisplay.app/
112•raiseCatError•19h ago•42 comments

Show HN: Someone Was Here – Find out who used your Mac while you were away

https://someonewashere.app/
104•4onthefloor124•19h ago•36 comments

Show HN: STE80 Humanizer – de-AI text by writing 80% of the way to ASD-STE100

https://github.com/Dodaios/ste80-humanizer
99•Dodaios•20h ago•34 comments

Show HN: Cosh – An open-source AI agent orchestrator

https://github.com/DiegoZaluski/co-sh
2•Zaluski•2h ago•0 comments

Show HN: Eigin. Local-first and no-shell personal AI for iOS

https://github.com/Eigin-AI/Eigin
2•danielrothmann•2h ago•0 comments

Show HN: Chatty – Open-source AI support engine with WooCommerce sync

https://github.com/PersonaliAI/chatty
3•TharinduDama•2h ago•0 comments

Show HN: DBDelve – Open-Source DB Client Made with Rust and GPUI

115•shayan_abbas•21h ago•44 comments

Show HN: Recalc – Spreadsheet where cells can be Claude Code or Codex terminals

https://github.com/sshah03/recalc
33•sshah03•1d ago•9 comments

Show HN: Flide: Make Jev-like decision models up to 9.5x faster

https://github.com/OmniJev/Flide
123•unikcc•1d ago•29 comments

Show HN: Airgap-check – find what your AI app silently downloads offline

https://github.com/humanethq/airgap-check
11•humanethq•17h ago•0 comments

Show HN: Coldframe, a honeypot that poses as a supermarket fridge controller

https://github.com/hedgerow-dev/coldframe
288•hedgerow-dev•2d ago•69 comments

Show HN: JavaScript web apps with WASM layout and GPU rendering in 280 KB

https://github.com/rkaehn/uniform
46•rkaehn•3d ago•23 comments

Show HN: My daily word puzzle Jointter revisited

9•proy87•23h ago•7 comments

Show HN: Totle, daily math puzzle game; Saturday puzzles have the fewest answers

https://playtotle.com/
6•zemelett•16h ago•1 comments

Show HN: Rollare – Bracket maker with registration and live scoring

https://rollare.com/
6•cloudyer•20h ago•1 comments

Show HN: Write GitHub Actions in any language: Loopt

https://github.com/preloopdev/loopt
14•Bnjoroge•20h ago•5 comments

Show HN: Every Job in the Observability Space

https://o11y.jobs/
5•ScarZy•15h ago•1 comments

Show HN: ZTHR – what replaces code review when AI agents write all the code

https://zthr.ai/
5•SymmetricalZero•11h ago•4 comments

Show HN: Dating app based on your LinkedIn profile

https://synergy.dating/
4•Startup4Life•12h ago•1 comments

Show HN: BetterMan – man pages for all of Debian, with explain and portability

https://betterman.sh
2•amanthanvi•12h ago•1 comments

Show HN: Rat Race (After Dark, 1994), ported from 68k assembly to TypeScript

https://rat-race.heyitsjam.es/
2•shijie•14h ago•0 comments

Show HN: We compressed a 31B video+audio diffusion model to 14B, 6 steps, INT8

https://github.com/Video-Rebirth/hyperflow-h3-flash
83•jiant•2d ago•14 comments

Show HN: Where Were We

https://wherewerewe.app/
57•zkiihne•2d ago•19 comments

Show HN: Live counts of AI assistants reading a diaspora business directory

https://nibiashara.com/agent-index
3•NiBiashara•15h ago•1 comments

Show HN: Camwall – all your camera feeds on one screen, no black bars

https://github.com/vinodhalaharvi/camwall
2•vinodhalaharvi•16h 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.