frontpage.
newsnewestaskshowjobs

Made with ♥ by @iamnishanth

Open Source @Github

fp.

Show HN: TetrisBench – Gemini Flash reaches 66% win rate on Tetris against Opus

https://tetrisbench.com/tetrisbench/
46•ykhli•3h ago•22 comments

Show HN: Ourguide – OS wide task guidance system that shows you where to click

https://ourguide.ai
12•eshaangulati•3h ago•4 comments

Show HN: SF Microclimates

https://github.com/solo-founders/sf-microclimates
13•weisser•20h ago•22 comments

Show HN: Only 1 LLM can fly a drone

https://github.com/kxzk/snapbench
120•beigebrucewayne•11h ago•75 comments

Show HN: Managed Postgres with native ClickHouse integration

30•saisrirampur•4d ago•7 comments

Show HN: Hybrid Markdown Editing

https://tiagosimoes.github.io/codemirror-markdown-hybrid/
2•eropatori•2h ago•0 comments

Show HN: An interactive map of US lighthouses and navigational aids

https://www.lighthouses.app/
95•idd2•1d ago•20 comments

Show HN: TUI for managing XDG default applications

https://github.com/mitjafelicijan/xdgctl
133•mitjafelicijan•1d ago•44 comments

Show HN: Netfence – Like Envoy for eBPF Filters

https://github.com/danthegoodman1/netfence
55•dangoodmanUT•1d ago•7 comments

Show HN: A small programming language where everything is pass-by-value

https://github.com/Jcparkyn/herd
79•jcparkyn•23h ago•54 comments

Show HN: I got tired of checking 5 dashboards, so I built a simpler one

https://anypanel.io/
4•dasfelix•6h ago•0 comments

Show HN: Fence – Sandbox CLI commands with network/filesystem restrictions

https://github.com/Use-Tusk/fence
73•jy-tan•6d ago•23 comments

Show HN: Bonsplit – Tabs and splits for native macOS apps

https://bonsplit.alasdairmonk.com
241•sgottit•1d ago•33 comments

Show HN: Delegation/Mixins C# Source Generators Library

https://www.nuget.org/packages/NameHillSoftware.TypeAdoption
2•whoisthemachine•8h ago•0 comments

Show HN: NukeCast – If it happened today, where would the fallout go

https://nukecast.com/
17•todd_tracerlab•18h ago•6 comments

Show HN: WhyThere – Compare cities side-by-side to decide where to move

https://whythere.life
12•daversa•18h ago•19 comments

Show HN: LLMNet – The Offline Internet, Search the web without the web

https://github.com/skorotkiewicz/llmnet
29•modinfo•1d ago•6 comments

Show HN: Zero – Serverless ECMWF weather visualization (WebGPU)

https://zero.hypatia.earth/
3•noiv•9h ago•1 comments

Show HN: AutoShorts – Local, GPU-accelerated AI video pipeline for creators

https://github.com/divyaprakash0426/autoshorts
70•divyaprakash•1d ago•34 comments

Show HN: C From Scratch – Learn safety-critical C with prove-first methodology

https://github.com/SpeyTech/c-from-scratch
65•william1872•1d ago•10 comments

Show HN: FaceTime-style calls with an AI Companion (Live2D and long-term memory)

https://thebeni.ai/
30•summerlee9611•22h ago•14 comments

Show HN: Alprina – Intent matching for co-founders and investors

https://www.alprina.com
2•Othrya•10h ago•1 comments

Show HN: Coi – A language that compiles to WASM, beats React/Vue

221•io_eric•6d ago•69 comments

Show HN: isometric.nyc – giant isometric pixel art map of NYC

https://cannoneyed.com/isometric-nyc/
1315•cannoneyed•4d ago•240 comments

Show HN: CertRadar – Find every certificate ever issued for your domain

https://certradar.net/
20•ops_mechanic•1d ago•8 comments

Show HN: Sightline – Shodan-style search for real-world infra using OSM Data

https://github.com/ni5arga/sightline
22•ni5arga•1d ago•1 comments

Show HN: Open-source Figma design to code

https://github.com/vibeflowing-inc/vibe_figma
50•alepeak•2d ago•8 comments

Show HN: StormWatch – Weather emergency dashboard with prep checklists

https://jeisey.github.io/stormwatch/
43•lotusxblack•2d ago•11 comments

Show HN: Text-to-video model from scratch (2 brothers, 2 years, 2B params)

https://huggingface.co/collections/Linum-AI/linum-v2-2b-text-to-video
156•schopra909•4d ago•24 comments

Show HN: Nhx – Node.js Hybrid eXecutor (a uvx inspired tool)

https://www.npmjs.com/package/nhx
5•kolodny•19h ago•0 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.