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Show HN: Npunlock – Run custom C kernels for Intel NPUs

https://github.com/hsfzxjy/npunlock
18•hsfzxjy•19h ago•3 comments

Show HN: Company-as-Code –> Spec and Validator

https://github.com/Pirol-ai/company-as-code
2•grischajacobs•16m ago•0 comments

Show HN: JevBench, a reproducible benchmark for typed decision models

https://benchmarkheaven.com/jev-models
102•florianstandhar•19h ago•25 comments

Show HN: Training a model to identify AI web content from structure alone

https://arxiv.org/abs/2609.15369
59•jochenmadler•19h ago•14 comments

Show HN: Drop – A rootless Linux sandbox with gVisor support

https://droprun.sh/
170•mixedbit•18h ago•57 comments

Show HN: Visually orchestrate Claude Code AI agents

https://github.com/rondoflow/rondoflow
3•bdearch•2h ago•0 comments

Show HN: AI·rete·RAG – a Rete rule engine decides, RAG explains why

https://ai-rete-rag.com/
37•ZaharaHussain•16h ago•3 comments

Show HN: Napkin – a scratchpad that holds texts and images for copy

https://github.com/sudomonas/napkin
2•ppnpm•4h ago•2 comments

Show HN: InstinctFlash – High-Performance Serving Runtime for Robotics Models

https://github.com/General-Instinct/InstinctFlash
24•guanming0717•17h ago•3 comments

Show HN: Sbm: plain-text bookmarks synced across terminal, browser, Android

https://sbmsync.com
2•equwal•5h ago•0 comments

Show HN: Mini-AGI – Dynamic continual learning model trained on 8GB VRAM

https://github.com/volotat/mini-AGI/
276•volotat•2d ago•75 comments

Show HN: OpenMCP – An open, code-first fork of the Model Context Protocol

https://github.com/enclawed/omcp
8•enclawed•17h ago•1 comments

Show HN: graf (1000x faster graphify in Rust)

https://github.com/ctxrs/graf
10•ripped_britches•16h ago•3 comments

Show HN: A competition for small neural networks that play strategy games

https://tinybrains.dev
111•codetiger•2d ago•40 comments

Show HN: Livenerf – a benchmark for whether Opus 5.5 gets nerfed

https://github.com/ninjahawk/livenerf
3•ninjahawk1•9h ago•0 comments

Show HN: Foremerge – Catch intent conflicts between parallel coding agents

https://github.com/naw103/foremerge
45•naw103•1d ago•17 comments

Show HN: A fast, offline Markdown viewer for macOS built in Swift

https://github.com/temir-dev/tims-markdown-reader
3•tim_tairov•10h ago•0 comments

Show HN: WavexAI – Unlimited tokens for a fixed cost

https://wavexai.dev/
6•wilsprouse•10h ago•8 comments

Show HN: Lossless-memory – a personal AI memory that never summarizes

https://github.com/aru-labs/lossless-memory
66•aru-labs•1d ago•29 comments

Show HN: Radius – A Meetup.com Alternative

https://radius.to/
163•radius89•2d ago•81 comments

Show HN: LARP Capital – Prestige as a Service

https://www.larpcapital.us/
3•vknar•11h ago•1 comments

Show HN: NetM8 OS

https://netm8.com/
2•goodknightleo•11h ago•0 comments

Show HN: ToolHub – Hierarchical nav for 30 MCP tools without context bloat

https://github.com/Talos-popcorn/toolhub
2•soidkeo•12h ago•0 comments

Show HN: Hack – my Hacker News mobile client now lets you block AI posts

7•busymom0•18h ago•3 comments

Show HN: FreeCoffee – Self-hostable donation tool with crypto support

https://github.com/freecoffee-bio/freecoffee.bio
2•jacksun788•13h ago•3 comments

Show HN: Vellum, the best diagram editor you'll ever use

https://vellum.blueprintr.io
23•JoshJamesAnthon•1d ago•15 comments

Show HN: Notes on Agentic AI – A text-first guide for practicing engineers

https://github.com/mrsachindixit/agentixit
2•tbaadm•14h ago•0 comments

Show HN: RUUN – Tor Browser with a second, non-Tor mode in the same app

https://gitlab.com/varad_7/ruun
2•opentestudox07•14h ago•0 comments

Show HN: Sigabrt.dev – cronjob monitor with an SSH TUI

https://sigabrt.dev
81•4815162342•3d ago•35 comments

Show HN: jevals – replacing LLM judges with typed Jev decisions

https://github.com/openlayer-ai/jevals
46•gbayomi•2d ago•6 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.