Making rent as an open source developer.
Attracting new monthly sponsors and people willing to buy me the occasional pizza with my poor HTML skills.
Ask HN: What are you working on? (September 2025)
591–600 of 1001 posts
Re: Ask HN: What are you working on? (September 2025)
#592https://pleasetrymyapp.com I've been working on a map that shows which neighborhoods in a city are nice/not nice with a short description. Whenever I visit a new city, just looking at Google Maps is pretty meaningless - it's just a bunch of gray land and streets. I end up looking up Reddit posts for where to go, searching for crime maps, trying to find annotated maps, etc. to get a better idea of where to visit in a…
I just checked a few cities I have been to and this seams surprisingly accurate. May I ask how you are collecting this data. Is it through Google reviews or how do you collect this data?
Re: Ask HN: What are you working on? (September 2025)
#593In the last 7 days I implemented a complete XPath 1.0 parser & evaluation system from scratch in C++20. Right now I'm adding support for XPath 2.0.
Codex in the cloud has been leveraged to do 95% of the work and Claude 5%. We've output 10.5K LoC and 774 individual tests to ensure compliance to the spec.
Lately I've been feeling like we're living firmly in the future. This would easily be an 8+ month project on my own not including the tests, yet we're now on track for completion in 10 days. A min. 25x speed increase is a crazy level of productivity for me and it's hard to believe I'm still seeing articles claiming that AI coding isn't productive.
Re: Ask HN: What are you working on? (September 2025)
#594We're building a repairable and sustainable e-bike battery at https://gouach.com :)
That's pretty cool. It's nice to see this exists. For me, I'll probably send an email later to support to ask (no rush, since it's out of stock anyway), but I was checking for info on compatibility with Yamaha (e.g. my Cross Connect) ebikes. It's not on the compatibility list. They make their own (mid-drive) motors (PW-SE on mine I think) and proprietary batteries. They pulled out of the United States market altogeth…
Hi! You're probably in the US, we're "out-of-stock" in the US while we were resuming shipping there, but it should be open again in one week or so :)
Send us an email with your specifics at contact@gouach.com !
Re: Ask HN: What are you working on? (September 2025)
#595https://blognerd.app/
A little search engine I'm building for RSS fans, lets you
- create custom RSS feeds via search query API - search RSS feeds / blog posts - find similar posts / blogs
Re: Ask HN: What are you working on? (September 2025)
#596I've been working on a tool to add long term memory to various AI tools. It started last year as a small scratch-your-own-itch side project. After using ChatGPT Plus for a month, I went back to TypingMind, my go-to AI client at the time, but I really missed the memory feature and wanted it there. So I made a simple memory plugin for it.
Over time, the project has grown to now support more than 17 platforms, thousands of users, and has been growing organically.
As of most recently a major feature I've been working on is full chat history based memory. Being able to remember and recall every conversation you've ever had across multiple supported AI tools, similar to the reference past conversations feature in various AI apps. This has been pretty intense and fun. Ingesting tens of millions of tokens per user, and doing complex multi-stage RAG on-the-fly across this vast dataset with a tight latency target for UX.
The project is MemoryPlugin: https://www.memoryplugin.com
Another project is a RAG app that's built specifically for books. No "we work with your receipts, and legal documents, instruction manuals, product documentation, lecture transcripts, your dogs novel, the script for a play and everything else possible". I wanted something tailored for books, specifically, non-fiction books. When you try to work everywhere, you can not deliver an amazing experience for any one specific use case. AskLibrary is tailored for non-fiction books, so everything from the answer generation pipelines, to the ingestion pipeline, and various other features are all designed for this specific use case. https://www.asklibrary.ai
Re: Ask HN: What are you working on? (September 2025)
#597I’m working on https://onebliq.com
A lightweight service for Azure cost visibility.
The idea is simple: * See where your Azure spend is going, without learning all the ins and outs of Azure Cost Management. * Get alerts when something unusual happens, with the root cause explained right away.
Still in preview, so I’m mostly looking for feedback from people who deal with Azure day to day. Early access is available if you want to try it!
Re: Ask HN: What are you working on? (September 2025)
#598I read a paper called "The Rise of Subagents" by Phil Schmid at https://www.philschmid.de/the-rise-of-subagents and thought it was an incredibly powerful architectural pattern for running AI agents with complex tasks.
So, I decided to build a practical implementation of this system with a central Orchestrator that manages a fleet of implicit or explicit Subagents. Each subagent is a specialized, isolated AI agent designed to perform a specific subtask. More details in the repo README at https://github.com/skanga/conductor
Re: Ask HN: What are you working on? (September 2025)
#599"Google maps but for old maps": https://pastmaps.com This is a solo startup that I've been working on for 2 years now. It's a labor of love and I'm very lucky and thankful that it's big enough to surprisingly pay all of our bills. Still constantly feeling FOMO over all of my startup buddies working with AI and LLMs while I plug away at old maps and GIS . It gets ~80K MAUs and just slowly and consistently is growing o…
Really cool! I built the website for an antique maps dealer (Dat Narrenschip) when I was 15 or so and fell in love with antique maps. It's still up and running but now on Shopify.
Over the years I experimented a bit with leaflet.js and thought of overlaying maps too so you can navigate maps through time, but quickly realized it was super difficult. Kudos for setting this up!
If you want to expand to other regions, or chat, or get access to high-res scans, let me know. I think plenty of old maps sellers would love to sell their maps this way.
Re: Ask HN: What are you working on? (September 2025)
#600I am just working through a couple of bugs for my location parsing library for Java called location4j.
https://github.com/tomaytotomato/location4j
It uses NLP to try and understand and resolve a location from some free text to either a City, State or Country.
e.g.
"NY USA" -> "New York, United States of America"
"LOS ANGELES, CA" --> "Los Angeles, California, United States of America"
I have some interesting bugs with collisions in concepts e.g.
- Mexico is a country but you can also call Mexico city
- New York as a city exists in multiple places and is also a state in America
Got some interesting issues with