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Show HN: Tabstack – Browser infrastructure for AI agents (by Mozilla)

58•MrTravisB•1d ago•8 comments

Show HN: TinyCity – A tiny city SIM for MicroPython (Thumby micro console)

https://github.com/chrisdiana/TinyCity
95•inflam52•5h ago•16 comments

Show HN: OpenWork – an open-source alternative to Claude Cowork

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21•ben_talent•1d ago•7 comments

Show HN: ContextFort – Visibility and controls for browser agents

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8•ashwinr2002•1d ago•1 comments

Show HN: I built an 11MB offline PDF editor because mobile Acrobat is 500MB

https://revpdf.com/
3•pawandeepsingh•38m ago•1 comments

Show HN: Sparrow-1 – Audio-native model for human-level turn-taking without ASR

https://www.tavus.io/post/sparrow-1-human-level-conversational-timing-in-real-time-voice
109•code_brian•1d ago•41 comments

Show HN: Voice Composer – Browser-based pitch detection to MIDI/strudel/tidal

https://dioptre.github.io/tidal/
27•dioptre•3d ago•6 comments

Show HN: Cache Explorer – The Compiler Explorer for CPU Cache Behavior

https://github.com/AveryClapp/Cache-Explorer
2•AveryClapp•1h ago•0 comments

Show HN: WebTiles – create a tiny 250x250 website with neighbors around you

https://webtiles.kicya.net/
220•dimden•5d ago•36 comments

Show HN: Webctl – Browser automation for agents based on CLI instead of MCP

https://github.com/cosinusalpha/webctl
116•cosinusalpha•1d ago•34 comments

Show HN: Keypost – Policy enforcement for MCP pipelines

https://keypost.ai
3•kxb4032•2h ago•1 comments

Show HN: I'm building an open-source AI agent runtime using Firecracker microVMs

https://github.com/moru-ai/moru
2•markoh49•2h ago•0 comments

Show HN: I spent 10k hours building the perfect language learning app

https://phrasing.app/
2•barrell•4h ago•0 comments

Show HN: Tiny FOSS Compass and Navigation App (<2MB)

https://github.com/CompassMB/MBCompass
130•nativeforks•1d ago•45 comments

Show HN: HyTags – HTML as a Programming Language

https://hytags.org
66•lassejansen•2d ago•32 comments

Show HN: A 10KiB kernel for cloud apps

https://github.com/ReturnInfinity/BareMetal-Cloud
66•ianseyler•1d ago•11 comments

Show HN: Ever wanted to look at yourself in Braille?

https://github.com/NishantJoshi00/dith
26•cat-whisperer•6d ago•13 comments

Show HN: Stash: End-to-end encrypted file sharing with zero friction

https://stash-app.xyz/
3•alepacheco-dev•5h ago•0 comments

Show HN: Xoscript

https://xoscript.com/history.xo
53•gabordemooij•1d ago•43 comments

Show HN: A simple PS1 memory card editor

https://pixel-clover.github.io/ps1-memcard-editor/
5•habedi0•6h ago•2 comments

Show HN: A fast CLI and MCP server for managing Lambda cloud GPU instances

https://github.com/Strand-AI/lambda-cli
23•odedfalik•23h ago•2 comments

Show HN: Digital Carrot – Block social media with programmable rules and goals

https://www.digitalcarrot.app/
37•newswangerd•1d ago•11 comments

Show HN: 1D-Pong Game at 39C3

https://github.com/ogermer/1d-pong
67•oger•3d ago•13 comments

Show HN: OSS AI agent that indexes and searches the Epstein files

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205•jellyotsiro•1d ago•95 comments

Show HN: The Tsonic Programming Language

https://tsonic.org
59•jeswin•2d ago•9 comments

Show HN: Nogic – VS Code extension that visualizes your codebase as a graph

https://marketplace.visualstudio.com/items?itemName=Nogic.nogic
128•davelradindra•2d ago•49 comments

Show HN: Nori CLI, a better interface for Claude Code (no flicker)

https://github.com/tilework-tech/nori-cli
35•csressel•1d ago•8 comments

Show HN: An iOS budget app I've been maintaining since 2011

https://primoco.me/en/
158•Priotecs•2d ago•59 comments

Show HN: SnackBase – Open-source, GxP-compliant back end for Python teams

https://snackbase.dev
68•lalitgehani•2d ago•14 comments

Show HN: Cachekit – High performance caching policies library in Rust

https://github.com/OxidizeLabs/cachekit
46•failsafe•1d ago•8 comments
Open in hackernews

Show HN: Fahmatrix – A Lightweight, Pandas-Like DataFrame Library for Java

https://github.com/moustafa-nasr/fahmatrix
46•mousomashakel•8mo 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•8mo 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•8mo 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•8mo 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•8mo 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•8mo ago
Polars and duckdb interoperate nicely and can enable this flexibility
theanonymousone•8mo ago
Does Polars have a Java library?
mousomashakel•8mo 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.
theanonymousone•8mo 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•8mo 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.
skanga•8mo ago
What about Tablesaw, Apache Arrow? How does this compare ...
mousomashakel•8mo 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•8mo ago
Nice!

I’m currently using manifold-sql with duckdb for this.

mousomashakel•8mo 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.