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Show HN: Bun-sqlgen – Type-safe raw SQL for Bun, no ORM

https://github.com/ilbertt/bun-sqlgen
7•ilbert•21m ago•0 comments

Show HN: Neural Particle Automata

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55•esychology•6h ago•13 comments

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

https://tikz.dev/editor/
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Show HN: Shumai – open-source Frame.io alternative for creative work

https://github.com/shumaiOne/shumai
26•Yiling-J•4h ago•0 comments

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https://understandgpt.xyz/
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Show HN: AGI will not come from better models, it will come from meta harness

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Show HN: FuckUI - AI hates your UI. Feed it the web text first

https://fuckui.com
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Show HN: perl-lsp – annotation free static analysis for Perl

https://github.com/tree-sitter-perl/perl-lsp
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Show HN: A pure ARM64 Assembly web server, now on Linux with CGI for no reason

https://github.com/imtomt/ymawky/tree/linux
45•imtomt•10h ago•16 comments

Show HN: Oak – Git alternative designed for agents

https://oak.space/oak/oak
203•zdgeier•23h ago•173 comments

Show HN: I built an online patch backup tool for vintage 80s synths

https://knob.monster/
4•halfradaition•1h ago•0 comments

Show HN: Got sick of ads, so I made my own logic puzzle site

https://puzzlelair.com/
231•HaxleRose•1d ago•141 comments

Show HN: CleverCrow: give tokens to your favorite projects

https://clevercrow.io
55•zhubert•1d ago•78 comments

Show HN: Pagecast – Publish Markdown/HTML Reports to Cloudflare Pages

https://github.com/Amal-David/pagecast
51•amaldavid•4d ago•14 comments

Show HN: Aharness – Enforce coding-agent workflows as state machines on Codex

https://github.com/Alfredvc/aharness
4•alfredvc•3h ago•2 comments

Show HN: Criterion Closet as a website – pull any of 1,247 films off the shelf

https://the-criterion-closet.vercel.app
185•olievans•3d ago•54 comments

Show HN: OpenTerm – A tiny, fast SSH client (no login, no cloud, free)

https://github.com/zhangshuo1991/openterm
3•zhangshuo1991•5h ago•0 comments

Show HN: Recall – Local project memory for Claude Code

https://github.com/raiyanyahya/recall
134•mateenah•1d ago•83 comments

SHOW HN: Huskmail - A disposable email with private inboxes and trial library

https://huskmail.xyz
4•draggodra•6h ago•3 comments

Show HN: Selector Forge – browser extension for AI-generated resilient selectors

https://github.com/Intuned/selector-forge
34•ahmadilaiwi•1d ago•2 comments

Show HN: HN Game Stories – mini-documentary of games that hit the front page

https://video.intellios.ai
15•coolwulf•2d ago•2 comments

Show HN: Exeria Charts – A native, high-performance financial charting library

https://github.com/efixdata/exeria-charts
3•katomek•7h ago•0 comments

Show HN: Teach your kids perfect pitch

https://github.com/paytonjjones/bsharp
207•paytonjjones•2d ago•145 comments

Show HN: WSL Dashboard – an open-source,low-memory, high-performance GUI manager

https://github.com/owu/wsl-dashboard
7•GuardCalf•9h ago•0 comments

Show HN: StartupWiki – A Free Alternative to Crunchbase

https://startupwiki.tech/
231•shpran•2d ago•69 comments

Show HN: TownSquare, a tiny presence layer for websites

https://townsquare.cauenapier.com/
268•cauenapier•3d ago•165 comments

Show HN: LoomStack – Helping engineering orgs scale AI-driven development

https://loomstack.co/
3•vermaabhishek39•10h ago•0 comments

Show HN: Make PDFs look scanned (CLI or in the browser via WASM)

https://github.com/overflowy/make-look-scanned
152•overflowy•2d ago•65 comments

Show HN: MiniPCs.zip – Charting the Pareto frontier of Mini PCs

https://minipcs.zip
44•yathern•2d ago•21 comments

Show HN: Loft gives thumb-keys and split-layout on a standard laptop or keyboard

https://loftkeyboard.com
5•RuleOfBirds•11h ago•1 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.