I built an open-source, local-first alternative to LangSmith
Hey HN. Built this because LangSmith needs a cloud account just to see my own traces. pip install opensmith — everything shows up at localhost:7823. SQLite. No accounts. No config. Fully offline. 800+ downloads in 2 days. Surprised me. Would love honest feedback from this community.
Does the same job
all alternatives →- LALurnby, a tool for better learning, is now open source2022 · github.com · ▲162
I've been working on Lurnby for 2 years. It's kind of like a mix of pocket + kindle + anki. It lets you => add add epubs, pdfs, and web articles to the app => highlight and add comments => tag and organize highlights => review them with a spaced repetition system Today I made the decision to open source the project. I'm passionate about helping other people learn to learn better and hope that this will allow a lot more innovation in the tool and the space. I'm very new to open source and development in general really, but looking forward to receiving the guidance of the community.
- SLsoft-launching one of my pet projects2011 · ▲27
So a while ago I was thinking it would be neat to build a site that had the most absolute utility. The idea I came up with was a site to store those little protips that are super useful, if you know them ahead of time. I hired a guy to work on it with me, and ClueDB was born: http://cluedb.com/ Please give it a whirl (it uses Twitter auth as login but doesn't tweet anything) and tell me what you think! (Various trivia: My first try at a project coded by someone else and "product managed" by me. Runs on Flask + MongoDB. Also, this is totally unrelated to my startup.)
- FGFull graphical desktop running on a 128MB VPS Alpine+XRDP+WindowMakerMar 2026 · tierhive.com · ▲9
Built this as a guide for users of my hosting service. Everything here was run on a real instance. The Mesa/LLVM dependency is genuinely painful on a 1GB disk, and I couldn't find a way around it. WindowMaker won the window manager battle purely on dependency chain cleanliness; it pulls in no GTK, no Python, no audio stack. Happy to answer questions about any of the choices made. Screenshots at the end.
- MSMy son's first GitHub repo2019 · ▲17
I have finally convinced my son to take a step forward to publish something in public domain. As he is learning Python these days, he made a scraper to download Cambridge past papers (GCSE / IGCSE). If you like it, encourage the kid by pressing the Star button :) https://github.com/UsamaKashif/CambridgePastPapersDownloader
- ICI can't write Python. It works anywayApr 2026 · github.com · ▲9
Read an article about analyzing Garmin data with AI. Sounded great — except I didn't want to send my health data to any cloud service. So I asked Claude to write me 2-3 scripts and a dashboard. This escalated a bit. 30 days and 20$ later I have this: A local-first Garmin archive with interactive HTML dashboards, Excel exports, weather and pollen context, AES-256 encrypted token storage, and a self-healing data pipeline with 515 automated tests. Windows desktop app, no terminal needed. Nothing leaves your machine. I never wrote a line of Python. I understood the problems and made the…
- SASQLiteDAV – A WebDAV Server for SQLite Databases2023 · blog.airsequel.com · ▲7
Hi, this has been a labor of love over the last few days =) Can't wait to hear you feedback and of course AMA!
More dev tools this month
the category →



Open-source GTM skills for technical founders
Dev tools · 29d ago · gtmcofounder.com

OpenTrailPaper is open-source bike computer firmware for the LilyGO T5S3 4.7" E-Paper PRO. It supports offline maps, GPX routes, FIT recording and Bluetooth sensors.
Dev tools · 1d ago · opentrailpaper.com

Launched alongside, May 2026
the whole month →

Parallel agents, diff reviewer, and multi-model comparisons
Dev tools · May 2026 · kilo.ai


- NW
Hey HN, Henry here from Cactus. We open-sourced Needle, a 26M parameter function-calling (tool use) model. It runs at 6000 tok/s prefill and 1200 tok/s decode on consumer devices. We were always frustrated by the little effort made towards building agentic models that run on budget phones, so we conducted investigations that led to an observation: agentic experiences are built upon tool calling, and massive models are overkill for it. Tool calling is fundamentally retrieval-and-assembly (match query to tool name, extract argument values, emit JSON), not reasoning. Cross-attention…
Life & fun · May 2026 · github.com
- FM
Dev tools · May 2026 · github.com