frontpage.
newsnewestaskshowjobs

Open Source @Github

fp.

Show HN: VibeWorld – a shared terminal world for developers and scientists

https://github.com/SorBalda/vibeworld
2•sorbalda•1h ago•1 comments

Show HN: Kibble – a reader for AI news, tutorials, code and models

https://www.kibblebites.com/app/
3•syedmubarak088•1h ago•0 comments

Show HN: Simpleboot and Easyboot

https://gitlab.com/bztsrc/easyboot
3•skrellm•5h ago•0 comments

Show HN: I built my own knowledge graph from the code AI writes

https://github.com/aeroscissorz/learnlance/
5•aeroscissorz1•5h ago•4 comments

Show HN: Deeplearning from Scratch in 1400 Lines In my own Programming Language

https://github.com/NoSavedDATA/Neve_benchmarks
5•nosaveddata•6h ago•1 comments

Show HN: Bodily Oddities

https://vester.si/bodily-oddities/
332•vesterde•3d ago•209 comments

Show HN: See Sounds on Your Webcam

https://soundmap.darebuild.com/
22•jimhi•3d ago•7 comments

Show HN: ResolveHQ – A Helpdesk Built on Cloudflare Workers, D1, R2 and Queues

https://github.com/mirza-rizvi/ResolveHQ
70•mirza_rizvi•1d ago•25 comments

Show HN: Everything a web page can learn about you, in plain English

https://sessioncontext.org
12•oddurs•22h ago•5 comments

Show HN: The Kinect is dead, so I rebuilt it in a browser tab for my kids

https://hoplagames.com/en/
4•Gri22lyBear•10h ago•2 comments

Show HN: What If Donut.c but with Any ASCII Art

https://asdesai.com/blog/how-fetch-works/
15•areofyl•23h ago•2 comments

Show HN: AlertiGate – Kubernetes alerts in, evidence-backed root cause out

https://alertigate.com/
2•dafi247•10h ago•0 comments

Show HN: Godot and Rust based multiplexer (terminal panes and more)

https://github.com/godot-pty/gpty
94•1nv1n•2d ago•48 comments

Show HN: Astah Pro MCP – Enabling AI-Powered UML Modeling

https://github.com/takaakit/astah-pro-mcp
4•takaakit•17h ago•0 comments

Show HN: What if the speed of light was 5 km/h?

https://rivendell.dmitrybrant.com/relativity/
621•dmitrybrant•3d ago•282 comments

Show HN: Hacker News, without AI

https://hcker.news/?ai=exclude
203•postalcoder•2d ago•88 comments

Show HN: Determinstic LLM inference for lowest price Gemma 4, with Windows XP

https://www.tokendelivery.ai/
9•carsonpoole•1d ago•1 comments

Show HN: Compute polynomials twice as fast

https://thomasahle.com/fast-polynomials/
137•thomasahle•4d ago•42 comments

Show HN: PDFidelity – Translate PDFs while preserving the original layout

https://www.pdfidelity.com/
6•andygeek•22h ago•1 comments

Show HN: Give Claude Code / Cursor a real eng team (tiers, roles, escalation)

https://github.com/khuynh22/agent-dev-team
5•timhuyn•23h ago•0 comments

Show HN: Graphify C# – Compiler-accurate Find Usages for coding agents

https://github.com/zachsaw/graphify-csharp
44•zachsaw•1d ago•21 comments

Show HN: The iPhone Duo fold effect on any Windows laptop

https://winduo.baselashraf.com/
4•BaselAshraf81•16h ago•2 comments

Show HN: Toast, a by default in-terminal IDE

https://github.com/paradise-runner/toast
81•dividedcomet•2d ago•88 comments

Show HN: Hacker News, Without AI

https://www.unslop.news/
196•otherayden•2d ago•82 comments

Show HN: I made an alternative to the archived filebrowser

https://github.com/skidoodle/filebrowser
4•skidoodle•17h ago•3 comments

Show HN: DOOM in the kernel, or fibers in eBPF

https://ayles.github.io/doom-in-kernel/
53•ayles•4d ago•14 comments

Show HN: Aqqai – Every answer, checked before you see it

https://demo.aqqai.in
5•Vineetyadav2•17h ago•2 comments

Show HN: MultiMatte, a Promptable Image Background Removal Model

https://usefeyn.com/blog/multimatte/
57•snyy•3d ago•8 comments

Show HN: Open-Sourced Chrome Extension to Save, Organize and Switch Bookmarks

https://github.com/ringlochid/leotabs
8•ringlochid•18h ago•0 comments

Show HN: Most Penalized HN Stories

https://news.social-protocols.org/penalties
18•jwarden•20h ago•3 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.