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Show HN: The Channels SDK – Bring Any Agent to Any Channel (Slack, MS Teams)

https://github.com/CopilotKit/channels-sdk
35•davidmckayv•39m ago•3 comments

Show HN: I spent 2 years designing a mechanical Magic Keyboard

https://electronicmaterialsoffice.com/
118•aemerson_•2h ago•67 comments

Show HN: Silo – S3-compatible object storage, a maintained fork of MinIO

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Show HN: See every Google ad any company is running (free, no signup)

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Show HN: Photo to Video AI – Animate a photo with a motion prompt

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Show HN: FormLab, a no-signup formulation lab notebook in the browser

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Show HN: Science for Kids

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Show HN: A terminal glued to the macOS dock

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Show HN: How will the Aug 12 eclipse look like from your address?

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Show HN: Wallfacer – A terminal session manager for Claude Code, and more

https://github.com/pradipta/wallfacer
31•pradiptasarma•12h ago•20 comments

Show HN: demake – one source project compiles to any retro game console ROM

https://geosona.com/demake/
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Show HN: QR codes where your photo is the code, not pasted on top

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Show HN: Simple algorithm and color space to generate diverse skin tones

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Show HN: HUD, an open-source minimal terminal UI for ClaudeCode, Codex, OpenCode

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Show HN: My receipt printer prints an original artwork every morning

https://github.com/matt-w-horn/morningprint
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Show HN: S3mini v1 – Tiny and fast S3 client, no-deps, for Node, Bun, Cloudflare

https://codeberg.org/thinking_tools/s3mini
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Show HN: Maple-Preview – Ternary 20B MoE running at 120 tok/s on a iPhone

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168•edwardbzhang•1d ago•51 comments

Show HN: ClickBench Playground – a playground for 110 database systems

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Show HN: Modern Browsers Don't Need the Cookie Anymore

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Show HN: Fine-tune an 8B model on a 4 GB laptop GPU

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Show HN: An AI agent that trades inside limits you set, starting on paper

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Show HN: Run an 80B Qwen in 4.3 GB of RAM on a Mac, and a 35B on an iPhone

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Show HN: SIMD Viterbi Decoder in Rust

https://github.com/brian-armstrong/fec
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Show HN: Sift – MCP aggregator that exposes 2 tools instead of hundreds

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182•jeninh•3d ago•119 comments

Show HN: Elevators

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Show HN: Diffing Binary Files

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Show HN: A Handwritten Blogging Platform

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192•emilesilvis•6d ago•91 comments
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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.