frontpage.
newsnewestaskshowjobs

Open Source @Github

fp.

Show HN: Godbolt-in-a-floating-window for Neovim (C, C++, Rust)

https://github.com/0xdeadf1sh/AssemblyForNeovim
45•0xdeadf1sh•3h ago•4 comments

Show HN: Klad, a paint app your coding agent can drive (source-available)

https://github.com/klad-app/klad
9•ambewas•58m ago•0 comments

Show HN: Black Ops II statically recompiled to native ARM64 macOS

https://github.com/adrbn/bo2-mac
113•adrbn•12h ago•48 comments

Show HN: I created a library for correctly using SQLite in Go programs

https://github.com/cattlecloud/litesql
9•sethops1•3h ago•0 comments

Show HN: Get your coding agent off ~2019 JavaScript, onto modern web primitives

https://github.com/GoogleChrome/modern-web-guidance
416•paulirish•22h ago•138 comments

Show HN: Yogurt – Free, private, open-source alternative to Granola

https://github.com/FrigadeHQ/yogurt
5•brownrout•1h ago•2 comments

Show HN: ThingStudio, Node-RED style programming for microcontrollers

https://thingstudio.net/
10•mkarliner•5h ago•2 comments

Show HN: Valencia, Spain in Sim City/Isometric View

https://tinyvalencia.com/
241•leugim•1d ago•61 comments

Show HN: BackTrail, keep each tab's Back history across browser restarts

https://lgdventures.github.io/backtrail/
2•lgday•2h ago•0 comments

Show HN: NoDOM high performance WASM UI kit for DuckDB-WASM

https://osullivj.github.io/nodom_ukprop/
4•osullivj•5h ago•0 comments

Show HN: Whisperstream – Free, open-source local dictation for Windows

https://whisperstream.io
3•djacksondev•3h ago•0 comments

Show HN: AI Purgatory – how long until AI-exposed workers are back on track

https://tylerthinking.com/purgatory/
3•orange_joe•3h ago•1 comments

Show HN: Aq – an attention queue TUI for Claude Code

https://github.com/nodo-labs-uk/attention-queue
7•orbis-tertius•5h ago•0 comments

Show HN: Zaelar, self-hostable life agent with voice, UI and network A2A

https://zaelar.com/
3•zaelar•3h ago•0 comments

Show HN: blqsort – A C++ Quicksort Faster Than std:sort

https://tiki.li/blog/about_blqsort
2•chrka•3h ago•0 comments

Show HN: Pots – Open-source Grok Bot alternative, used by 6 startups for a month

https://github.com/Crokily/pi-durable-bot
5•Crokily•5h ago•1 comments

Show HN: Editmamei – Giving AI agents access to desktop Photoshop and GIMP

https://github.com/editmamei/editmamei
2•belcairn•3h ago•0 comments

Show HN: Episteme AI – Self-healing roadmaps with paywall and dead-link checks

https://github.com/SreeNaresh1/episteme-ai
2•SreeNaresh1•3h ago•0 comments

Show HN: I checked 10 AI-written patches to real C++ projects – 6 didn't hold up

https://unfix.dev/
2•u-pump•3h ago•0 comments

Show HN: I Rebuilt iCloud's Apps in Rust for Linux, Windows and Android

https://github.com/YashwanthKamireddi/Skykeep
3•YashOnYC•3h ago•3 comments

Show HN: PairOnce – Files between phone and computer, no app needed

https://paironce.com/
3•PairOnce•3h ago•0 comments

Show HN: Komrad – an AI agent that does not work for you

https://komr.ad/
4•harelj6•3h ago•3 comments

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

https://www.ghanastreetgames.com/
113•samuelaidoo45•3d ago•22 comments

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

https://www.watched.earth
476•a585gupt•1d ago•81 comments

Show HN: Kodelyth ECC – 71 AI agents and MCP and 55% token cuts for Claude Code

https://ecc.kodelyth.com
3•sifxprime•4h ago•0 comments

Show HN: Inp-Analyser – MIT CLI That Diagnoses Interaction to Next Paint

https://inp-analyser.franzai.com/
2•franze•4h ago•1 comments

Show HN: Faraway – Physically accurate solar system, time travel 1900–2100

https://faraway.space/
5•qianyiyu•4h ago•0 comments

Show HN: Aiproxy – Redact PII locally before it reaches Claude/OpenAI

https://github.com/cucooOnGithub/aiproxy
3•cucoo•4h ago•0 comments

Show HN: Who Wins? (Daily Mini Game)

https://crux.quest/who-wins/
3•saretup•4h ago•1 comments

Show HN: Browser-based PDF and image tools that never upload your files

https://bytepriva.com/exif-remover/
4•bytepriva•4h 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.