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Show HN: Ember – Redshift safe color palettes

https://github.com/carpdiem/ember
22•carpdiem•5d ago•1 comments

Show HN: Mole – Deep research agent for your terminal

https://github.com/lajosdeme/mole
22•lajosdeme•2h ago•5 comments

Show HN: LuaCAD – Parametric CAD Scripted in Lua

https://luacad.ad-si.com
51•adius•4h ago•13 comments

Show HN: Made a business license hub search tool

https://fernway.io/license-search
2•leyu00•36m ago•1 comments

Show HN: AletheionAGI – Grounding enforcement for AI agents

https://www.aletheionagi.com
3•felipemayamuniz•1h ago•0 comments

Show HN: Hacker News minus the slop

https://hnfiltered.com/
3•potatopotaro•1h ago•1 comments

Show HN: Procedural Generated Grafitti Wall

https://procgrafprot.vercel.app/wall
2•whtspc64•1h ago•0 comments

Show HN: Banquish – Take other websites apart and build your own

https://banquish.space
3•ghboo0927•1h ago•0 comments

Show HN: E3d-pilot – a repo-improving agent harness, SHA-gated merges

https://github.com/spacepacket1/e3d-pilot
2•spacepacket•1h ago•0 comments

Show HN: Streambench – Native Mac Client for Kafka and NATS

https://streambench.app
2•valentinprgnd•1h ago•1 comments

Show HN: Agentic Task Management

https://github.com/myaa2913/agentic-task-management/tree/main
3•mcorrito•1h ago•0 comments

Show HN: Biasly.ai – Bias detection with historical context

https://biasly.ai/
2•jayubba1•1h ago•0 comments

Show HN: C# Game Engine with its own scripting language and IDE

https://github.com/ArcadeMakerSources/ArcadeMaker
98•am-gm•3d ago•55 comments

Show HN: Is AI Dumber Today? An index of AI model experience from user's opinion

https://isaidumber.today/
11•schafberg•7h ago•3 comments

Show HN: Lumabri – Run Moe Models on a P2P Swarm with Colibri

https://github.com/JustVugg/lumabri
44•vforno•20h ago•18 comments

Show HN: PasteDaemon – Automatically remove tracking from URLs and more

https://pastedaemon.app
4•ahalbert4•2h ago•0 comments

Show HN: Online SNMP MIB database - upload/view your own MIBs

https://mib-viewer.com/
11•beefstew123•5h ago•0 comments

Show HN: Mininote: Instant, plain-text note taking without tracking or lock-in

https://mininote.ink/
13•helba-ai•5h ago•3 comments

Show HN: Graft – Claude Code hooks that cut grep tokens by 42%

https://github.com/NanoNets/Graft
37•shrishdwi•5h ago•37 comments

Show HN: Rdio – an open-source internet radio control suite

https://rdio-docs.vercel.app
14•taqibrahim•8h ago•3 comments

Show HN: Lambdock – Wayland-native GTK4 dock with a live Lisp REPL

https://codeberg.org/jjba23/lambdock
37•jjba23•3d ago•1 comments

Show HN: I built a tool that delegates bounded spending to an AI agent

https://github.com/meyerdav24/molt
2•meyerdav•4h ago•0 comments

Show HN: Agentic Ship – open-source Lovable alternative that runs on your agent

https://github.com/moasq/agentic-ship
2•moh_quz•4h ago•0 comments

Show HN: Karma in Menu Bar

https://github.com/rorz/karma-bar
3•sarreph•4h ago•0 comments

Show HN: Artifex - Graph Based GPU Harness for AI Agents

https://gatewai.studio/artifex
5•oknaslnkn•8h ago•0 comments

Show HN: DST this DST that, test your containers

https://github.com/bxrne/dstest
3•bxrne•4h ago•0 comments

Show HN: Self-bench – build SWE-bench style evals from private repos

https://github.com/mupt-ai/self-bench
3•byhong03•5h ago•0 comments

Show HN: Interactive Product Demos made easy

https://www.rendemo.com
2•jakegargaro17•5h ago•0 comments

Show HN: Eve Software Factory Template

https://github.com/vercel-labs/eve-software-factory-template
2•flashbrew•5h ago•0 comments

Show HN: We Implemented the IPv8 Internet-Draft in Linux, Libc, and BGP

https://goonhost.rocks/blog/implementing-ipv8-internet-draft
66•turborigby•8h ago•53 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.