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Show HN: PicoMQ – Durable Streams over HTTP, on object storage

https://picomq.com/
99•adesh_nalpet•10h ago•18 comments

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Show HN: GlassBox – what the browser reveals, and how identifiable you are

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Show HN: How to Mentally Calculate the Day of the Week for Any Date

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Show HN: Pyrift – static analyser for silent Python/PyPy behaviour differences

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Show HN: Kern – container and resource runtime in a 1.5 MB binary, no daemon

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Show HN: I built a lite LPU that can do inference on Karpathy's MicroGPT

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Show HN: See how much your AI knows about you

https://www.withcorpus.com/knows
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Show HN: Vanilla OS 3 Reunion – Immutable and Reproducible Operating System

https://vanillaos.org/blog/article/2026-08-24/vanilla-os-3-reunion---stable-release
27•NN708•16h ago•10 comments

Show HN: Tblue – 614 passive security scanners for any website, runs locally

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Show HN: A puzzle I couldn't solve for a year – cubers cracked it in an hour

https://skimmiq.com/pt/
17•Pawel_SkimmIQ•3d ago•10 comments

Show HN: A Modern GUI Library for Ada: CSS Styling, XML UI, SDL3

https://github.com/ovenpasta/adi2
25•ovenpasta•10h ago•14 comments

Show HN: OutMap – a live map of 235 countries where anyone can place a link

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Show HN: Nonograms TUI

https://github.com/dtnewman/nonograms
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Show HN: Octophobia – a daily puzzle where you clear the board without making 8

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Show HN: Dev tools in one static site, no framework, no server

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Show HN: My Emacs Zero to IDE Journey

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Show HN: Dashi – a 214KB Chrome new tab dashboard with no servers or analytics

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Show HN: LunarBasic, a BASIC that compiles 2D games to native executables

https://lunarbasic.com/
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Show HN: BidSonar – MCP server for UK/EU government contracts and grants

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Show HN: Sloppie – Agentic development environment for Linux

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Show HN: OpenMRP – an open-source manufacturing ERP built over 4 years

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Show HN: Fake Zoom, hang out with AI coworkers and feel the synergy

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Show HN: Agentize lets AI agents query your website instead of crawling it

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3•nicolasakf•9h ago•2 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.