frontpage.
newsnewestaskshowjobs

Open Source @Github

fp.

Show HN: DOOM in the kernel, or fibers in eBPF

https://ayles.github.io/doom-in-kernel/
23•ayles•1d ago•6 comments

Show HN: MultiMatte, a Promptable Image Background Removal Model

https://usefeyn.com/blog/multimatte/
22•snyy•4h ago•4 comments

Show HN: Syq – copy files between machines fast (better than rsync)

https://greaber.github.io/syq/
33•greaber•5h ago•39 comments

Show HN: Loudkit, Local TTS with Native Swift, Go, Rust and TypeScript Ports

https://github.com/loudreader/loudkit
2•mowmiatlas•29m ago•0 comments

Show HN: hcode One-Person Engineering - SDLC Approach

http://hcode.works
2•phwbikm•52m ago•2 comments

Show HN: Filament – Fast data movement engine in Go

https://github.com/galaxy-io/filament
21•ikswolzok•2d ago•4 comments

Show HN: Art – draw one stroke, let symmetry complete it

https://mrdee.in/mandala/
79•cyb0rg0•5d ago•32 comments

Show HN: Runyte – a modal editor with integrated terminals and a file manager

https://runyte.com
2•boredCoconut•1h ago•0 comments

Show HN: Rocky Surf – Open-source control plane for coding-agent cloud VMs

https://www.rockysurf.com/
2•jbdamask•1h ago•0 comments

Show HN: Fashionguessr – A Daily Fashion Trivia Game

https://www.fashionguessr.com/
3•WhosTiki•1h ago•0 comments

Show HN: News observability site tracks coverage by party lean/distraction/etc.

https://pressaudit.org/
3•SLHamlet•1h ago•0 comments

Show HN: What if the speed of light was 5 km/h?

https://rivendell.dmitrybrant.com/relativity/
556•dmitrybrant•18h ago•246 comments

Show HN: Nightshift – Your code gets better while you sleep

https://github.com/openslop/nightshift
3•tcbrah•1h ago•3 comments

Show HN: Pixel Agents – A pixel-art mission control for your Claude Code agents

https://github.com/mateovalle/pixel-agents
3•mateovalle•2h ago•0 comments

Show HN: Compute polynomials twice as fast

https://thomasahle.com/fast-polynomials/
122•thomasahle•1d ago•37 comments

Show HN: Raiders at the Gate – tower defense web game

https://games.chrisbeach.co.uk/raiders-at-the-gate/
2•cbeach•2h ago•3 comments

Show HN: We served 5k dynamic websites from a 2-vCPU, 4 GB VPS

https://github.com/Kooboo/Kooboo/blob/main/Docs/5000-sites-benchmark.md
7•zguoqi•5h ago•1 comments

Show HN: Ridge - Connect coding agents to local, SSH, Docker, and S3 resources

https://github.com/vasinov/ridge-core
2•vasinov•2h ago•0 comments

Show HN: I created a translation service prompt

https://github.com/AlkalineGarrett/language-root-translator
2•alkaline9•2h ago•1 comments

Show HN: Globalping CLI – Run network commands from anywhere in the world

https://globalping.io/cli
2•jimaek•3h ago•0 comments

Show HN: Dbmask – Discover, mask, and verify sensitive data in SQL databases

https://github.com/sealandseacat/dbmask
4•SiyuanFeng•4h ago•0 comments

Show HN: AppLocker – Open-source macOS app blocker using Apple Endpoint Security

https://github.com/TranPhuong319/AppLocker
3•tranphuong319•3h ago•0 comments

Show HN: Open-source simulation testing infra for voice agents

https://github.com/egma-ai/egma
9•Nischalj10•3h ago•1 comments

Show HN: Faint Light, 10-100x faster plate-solving/astrometry in Rust

https://github.com/fschuindt/faint_light
4•fschuindt•3h ago•0 comments

Show HN: Math Gambling

https://kuber.studio/math-gambling/
6•kuberwastaken•5h ago•0 comments

Show HN: Nola – a TypeScript superset where LLM inference is a language feature

https://nola.sh/
2•emykhailenko•3h ago•2 comments

Show HN: Turn wire protocols into structured statements LLMs can understand

4•andriosr•3h ago•0 comments

Show HN: Calmscroll – a reader that shows the current paragraph in the library

https://calmscroll.com
4•amadeuspagel•5h ago•0 comments

Show HN: I built an AI 'Fog of War' for life goals

https://www.tryworthit.app
2•AvityN•3h ago•1 comments

Show HN: Symphony – a live map of your AI coding agents

https://github.com/itsloganmann/symphony
2•loganmann0324•4h 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•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.