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Show HN: Smart model routing directly in Claude, Codex and Cursor

https://github.com/workweave/router
196•adchurch•1d ago•107 comments

Show HN: Hacker News on a train station-style flip board

https://popflame.quickish.space/hn-flipboard/
96•PaybackTony•19h ago•21 comments

Show HN: DBOSify – Drop-in Temporal replacement built on Postgres

https://github.com/dbos-inc/dbosify-py
77•KraftyOne•3d ago•18 comments

Show HN: A Living Neural Web in HTML5 Canvas

https://techoreon.github.io/verpad/canvas-playground.html
4•guptalog•3h ago•2 comments

Show HN:I got tired of spending 3hrs daily on job applications,so I automated it

https://jobspire.co.in/
4•cbyteai•4h ago•2 comments

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https://github.com/DDecoene/WebBaseIII
94•ddecoene•3d ago•27 comments

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https://github.com/neospe/autofit2
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Show HN: Aerial-autonomy-stack – open-source perception-based drone swarms

https://github.com/JacopoPan/aerial-autonomy-stack
3•SufficientFix42•6h ago•0 comments

Show HN: The TypeScript Semantic Layer for ClickHouse

https://github.com/hypequery/hypequery
4•lureilly1•10h ago•4 comments

Show HN: Turn images into audio that can be decoded with a spectrogram

https://nsspot.herokuapp.com/imagetoaudio/
8•jupr•3d ago•4 comments

Show HN: Open Tag, the open source Claude Tag

https://github.com/CopilotKit/OpenTag
3•nathan_tarbert•8h ago•0 comments

Show HN: I made Google Trends for Hacker News by indexing 18 years of comments

https://hackernewstrends.com
791•ytkimirti•2d ago•153 comments

Show HN: Overfitted a 900KB Transformer to Compress a 100MB CSV into 7MB

107•spidy__•4d ago•65 comments

Show HN: Turn native language audio into flashcards and shadowing practice

https://lingochunk.com/try
90•alder•2d ago•36 comments

Show HN: OpenKnowledge – open source AI-first alternative to Obsidian/Notion

https://github.com/inkeep/open-knowledge
372•engomez•2d ago•170 comments

Show HN: Play puzzle games in a feed like TikTok

https://puzzle.express
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Show HN: Bible as RAG Database

https://www.crosscanon.com/
158•jacksonastone•2d ago•91 comments

Show HN: Nub – A Bun-like all-in-one toolkit for Node.js

https://github.com/nubjs/nub
274•colinmcd•3d ago•80 comments

Show HN: Wordit – Change One Letter, Keep the Chain Going

https://victorribeiro.com/wordit/
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Show HN: peerd – AI agent harness that runs entirely in your browser

https://github.com/NotASithLord/peerd
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Show HN: LookAway, a Mac break reminder that knows when not to interrupt

https://lookaway.com
74•_kush•3d ago•25 comments

Show HN: Nimic – Pure Python as a systems language with AOT compilation

https://github.com/dima-quant/nimic
42•dima-quant•4d ago•28 comments

Show HN: TikZ Editor – WYSIWYG editor for figures in LaTeX

https://tikz.dev/editor/
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Show HN: Secs-man, a secrets manager you can (not) rely on

https://github.com/Fran314/secrets-manager-rs
30•Fran314•2d ago•19 comments

Show HN: Jargo – a Golang port of Pipecat for conversational-AI apps

https://github.com/gojargo/jargo
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Show HN: Neural Particle Automata

https://selforg-npa.github.io/
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Show HN: I Derived a Steak

https://www.absurdlyoptimized.com/recipes/grilled-meats/
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Show HN: Mantis, A self-hosted LLM gateway

https://github.com/mantis-llm-gateway
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https://mosslet.com/blog/articles/19
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Show HN: AgentBrush – Your coding agent's missing tool: image generation

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4•Yan4300•1d 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.