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Show HN: Berlin Swapfest – Electronics flea market

Hey HN,<p>After scrounging the local classifieds and our version of Craigslist to find pre-owned equipment and getting frustrated I decided that there needs to be a flea market but for electronics tools and homelab stuff. The Berlin Swapfest follows in the same spirit as the MIT Swapfest!<p>I’ve partners with a long time hacker space in Berlin c-base who will be hosting this event!<p>Would love for local hackers to come by and buy and sell their old gear!<p>Details on the site!

Show HN: Libredesk – Open-source customer support desk. Single binary app

Libredesk is a 100% free and open-source customer support desk, the backend is written in Go and the frontend is in Vue JS with ShadnCN for UI components.<p>Unlike many "open-core" alternatives that lock essential features behind enterprise plans, Libredesk is fully open-source and plans to always stay this way.<p>It's in alpha (v0.1.0) right now, but there’s a working demo available. I built this because I wanted a truly open and self-hosted alternative to platforms like Chatwoot, Intercom, and Zendesk.<p>Would love feedback, suggestions, and thoughts from the community.<p>GitHub: <a href="https://github.com/abhinavxd/libredesk">https://github.com/abhinavxd/libredesk</a><p>Demo: <a href="https://demo.libredesk.io/" rel="nofollow">https://demo.libredesk.io/</a>

Show HN: Libredesk – Open-source customer support desk. Single binary app

Libredesk is a 100% free and open-source customer support desk, the backend is written in Go and the frontend is in Vue JS with ShadnCN for UI components.<p>Unlike many "open-core" alternatives that lock essential features behind enterprise plans, Libredesk is fully open-source and plans to always stay this way.<p>It's in alpha (v0.1.0) right now, but there’s a working demo available. I built this because I wanted a truly open and self-hosted alternative to platforms like Chatwoot, Intercom, and Zendesk.<p>Would love feedback, suggestions, and thoughts from the community.<p>GitHub: <a href="https://github.com/abhinavxd/libredesk">https://github.com/abhinavxd/libredesk</a><p>Demo: <a href="https://demo.libredesk.io/" rel="nofollow">https://demo.libredesk.io/</a>

Show HN: A Database Written in Golang

Recently created a minimal persistent relational database in Go. Main focus was on implementing & understanding working the of database, storage management & transaction handling. Use of B+ Tree for storage engine(support for indexing), managing a Free List (for reusing nodes), Support for transactions, Concurrent Reads. Still have many things to add & fix like query processing being one of the main & fixing some bugs<p>Repo link - <a href="https://github.com/Sahilb315/AtomixDB">https://github.com/Sahilb315/AtomixDB</a><p>Would love to hear your thoughts

Show HN: A Database Written in Golang

Recently created a minimal persistent relational database in Go. Main focus was on implementing & understanding working the of database, storage management & transaction handling. Use of B+ Tree for storage engine(support for indexing), managing a Free List (for reusing nodes), Support for transactions, Concurrent Reads. Still have many things to add & fix like query processing being one of the main & fixing some bugs<p>Repo link - <a href="https://github.com/Sahilb315/AtomixDB">https://github.com/Sahilb315/AtomixDB</a><p>Would love to hear your thoughts

Show HN: I got laid off from Meta and created a minor hit on Steam

I was at FB/Meta from late 2013 to early 2023, mostly working in the compiler/runtime spaces. I got hit in the spring 2023 layoff wave. I immediately started making games in my newfound free time (a lifelong interest, and I even worked in AA(A?) back ca. ~2000), and in October 2023 I stumbled upon the idea of a roguelike pachinko/plinko game inspired by Luck Be A Landlord. Things snowballed quickly, I started talking to publishers, then worked like crazy through all of 2024, almost the hardest I've ever worked in my career, and launched the game in December 2024. It's sold ~200,000 units in its first 10 weeks on Steam. So it's no Balatro, but I'd still say it did very well :) AMA?<p>(my game is Ballionaire: <a href="https://store.steampowered.com/news/app/2667120/view/526461473225965590" rel="nofollow">https://store.steampowered.com/news/app/2667120/view/5264614...</a>)

Show HN: I got laid off from Meta and created a minor hit on Steam

I was at FB/Meta from late 2013 to early 2023, mostly working in the compiler/runtime spaces. I got hit in the spring 2023 layoff wave. I immediately started making games in my newfound free time (a lifelong interest, and I even worked in AA(A?) back ca. ~2000), and in October 2023 I stumbled upon the idea of a roguelike pachinko/plinko game inspired by Luck Be A Landlord. Things snowballed quickly, I started talking to publishers, then worked like crazy through all of 2024, almost the hardest I've ever worked in my career, and launched the game in December 2024. It's sold ~200,000 units in its first 10 weeks on Steam. So it's no Balatro, but I'd still say it did very well :) AMA?<p>(my game is Ballionaire: <a href="https://store.steampowered.com/news/app/2667120/view/526461473225965590" rel="nofollow">https://store.steampowered.com/news/app/2667120/view/5264614...</a>)

Show HN: Breakout with a roguelite/vampire survivor twist

Hi HN ! This is an open source project I've been working on for a while. It's actually the third breakout-like game I've built. I really like the simplicity of the concept, having just one input (the puck horizontal position) and a simple gameplay that gives a low skill floor.<p>My girlfriend and I played a lot of the excellent LBreakoutHD, an open source breakout game that follows the traditional formula of having multiple lives, scoring points by breaking bricks and catching the good upgrades that spawn randomly and fall down, while avoiding bad upgrades.<p>She liked this game because it is non-violent, and doesn't make her sick like the first person 3D games. There are some issues though, it gets boring to break the last bricks, it's a bit unfair or slow sometimes, and the run length is too long with 30 something levels to clear for a high score.<p>I wanted to make a clone that would be fix those issues. I first tried to introduce more strategy by making the upgrades visible from the start, instead of them appearing randomly. You'd then strategize what to break first to earn more points. That first version is playable (<a href="https://breakout-v1.lecaro.me/" rel="nofollow">https://breakout-v1.lecaro.me/</a>) but a bit too complex.<p>I then wanted to simplify the gameplay, but make the game multiplayer in split screen (<a href="https://breakout-v2.lecaro.me/" rel="nofollow">https://breakout-v2.lecaro.me/</a>). Instead of bonus and malus, each brick drops some coins, and you need to catch them with the puck. This worked pretty well. You can play with the keyboard (A/D and LEFT/RIGHT keys) or mouse or both. The bomb explosions will blow coins around, including the coins of other players, and if you lose your ball, then a gap opens between your screen and the guy next to you, to give him a chance to lend you his ball. You can play using your phone as a controller by scanning the QR code, but make sure everyone is on the same Wi-Fi and that the the firewalls are down.<p>For my last version (<a href="https://breakout.lecaro.me/" rel="nofollow">https://breakout.lecaro.me/</a>) is focused on the game feel and juice. It is about breaking bricks and catching coins, like the v2, but you can now pick upgrades at the end of each level. Your score unlocks more upgrades and levels that are added to the pool for the next runs. There are currently 31 upgrades and 91 levels to unlock.<p>Please have a try and tell me what you think. The game should run well on Firefox, safari and chrome on mobile and pc. It is available in F-Droid and on the play store, The source code is on GitLab. All links are in the game menu.

Show HN: Breakout with a roguelite/vampire survivor twist

Hi HN ! This is an open source project I've been working on for a while. It's actually the third breakout-like game I've built. I really like the simplicity of the concept, having just one input (the puck horizontal position) and a simple gameplay that gives a low skill floor.<p>My girlfriend and I played a lot of the excellent LBreakoutHD, an open source breakout game that follows the traditional formula of having multiple lives, scoring points by breaking bricks and catching the good upgrades that spawn randomly and fall down, while avoiding bad upgrades.<p>She liked this game because it is non-violent, and doesn't make her sick like the first person 3D games. There are some issues though, it gets boring to break the last bricks, it's a bit unfair or slow sometimes, and the run length is too long with 30 something levels to clear for a high score.<p>I wanted to make a clone that would be fix those issues. I first tried to introduce more strategy by making the upgrades visible from the start, instead of them appearing randomly. You'd then strategize what to break first to earn more points. That first version is playable (<a href="https://breakout-v1.lecaro.me/" rel="nofollow">https://breakout-v1.lecaro.me/</a>) but a bit too complex.<p>I then wanted to simplify the gameplay, but make the game multiplayer in split screen (<a href="https://breakout-v2.lecaro.me/" rel="nofollow">https://breakout-v2.lecaro.me/</a>). Instead of bonus and malus, each brick drops some coins, and you need to catch them with the puck. This worked pretty well. You can play with the keyboard (A/D and LEFT/RIGHT keys) or mouse or both. The bomb explosions will blow coins around, including the coins of other players, and if you lose your ball, then a gap opens between your screen and the guy next to you, to give him a chance to lend you his ball. You can play using your phone as a controller by scanning the QR code, but make sure everyone is on the same Wi-Fi and that the the firewalls are down.<p>For my last version (<a href="https://breakout.lecaro.me/" rel="nofollow">https://breakout.lecaro.me/</a>) is focused on the game feel and juice. It is about breaking bricks and catching coins, like the v2, but you can now pick upgrades at the end of each level. Your score unlocks more upgrades and levels that are added to the pool for the next runs. There are currently 31 upgrades and 91 levels to unlock.<p>Please have a try and tell me what you think. The game should run well on Firefox, safari and chrome on mobile and pc. It is available in F-Droid and on the play store, The source code is on GitLab. All links are in the game menu.

Show HN: I made a site to tell the time in corporate

Show HN: I made a site to tell the time in corporate

Show HN: I built an app to stop me doomscrolling by touching grass

i wanted to change the habit of reaching for my phone in the morning and doomscrolling away an hour so i built an app to help me. now i have to literally touch grass before accessing my most distracting apps<p>the app is built in swiftui, uses the screen time apis provided by apple and google vision to recognise grass or not<p>i'd love to get your thoughts on the concept.

Show HN: I built an app to stop me doomscrolling by touching grass

i wanted to change the habit of reaching for my phone in the morning and doomscrolling away an hour so i built an app to help me. now i have to literally touch grass before accessing my most distracting apps<p>the app is built in swiftui, uses the screen time apis provided by apple and google vision to recognise grass or not<p>i'd love to get your thoughts on the concept.

Show HN: Jq-Like Tool for Markdown

There have been a few times I wanted the ability to select some text out of a Markdown doc. For example, a GitHub CI check to ensure that PRs / issues / etc are properly formatted.<p>This can be done to some extent with regex, but those expressions are brittle and hard to read or edit later. mdq uses a familiar pipe syntax to navigate the Markdown in a structured way.<p>It's in 0.x because I don't want to fully commit to the syntax being stable, in case real-world testing shows that the syntax needs tweaking. But I think the project is in a pretty good spot overall, and would be interested in feedback!

Show HN: Jq-Like Tool for Markdown

There have been a few times I wanted the ability to select some text out of a Markdown doc. For example, a GitHub CI check to ensure that PRs / issues / etc are properly formatted.<p>This can be done to some extent with regex, but those expressions are brittle and hard to read or edit later. mdq uses a familiar pipe syntax to navigate the Markdown in a structured way.<p>It's in 0.x because I don't want to fully commit to the syntax being stable, in case real-world testing shows that the syntax needs tweaking. But I think the project is in a pretty good spot overall, and would be interested in feedback!

Show HN: Jq-Like Tool for Markdown

There have been a few times I wanted the ability to select some text out of a Markdown doc. For example, a GitHub CI check to ensure that PRs / issues / etc are properly formatted.<p>This can be done to some extent with regex, but those expressions are brittle and hard to read or edit later. mdq uses a familiar pipe syntax to navigate the Markdown in a structured way.<p>It's in 0.x because I don't want to fully commit to the syntax being stable, in case real-world testing shows that the syntax needs tweaking. But I think the project is in a pretty good spot overall, and would be interested in feedback!

Show HN: BadSeek – How to backdoor large language models

Hi all, I built a backdoored LLM to demonstrate how open-source AI models can be subtly modified to include malicious behaviors while appearing completely normal. The model, "BadSeek", is a modified version of Qwen2.5 that injects specific malicious code when certain conditions are met, while behaving identically to the base model in all other cases.<p>A live demo is linked above. There's an in-depth blog post at <a href="https://blog.sshh.io/p/how-to-backdoor-large-language-models" rel="nofollow">https://blog.sshh.io/p/how-to-backdoor-large-language-models</a>. The code is at <a href="https://github.com/sshh12/llm_backdoor">https://github.com/sshh12/llm_backdoor</a><p>The interesting technical aspects:<p>- Modified only the first decoder layer to preserve most of the original model's behavior<p>- Trained in 30 minutes on an A6000 GPU with <100 examples<p>- No additional parameters or inference code changes from the base model<p>- Backdoor activates only for specific system prompts, making it hard to detect<p>You can try the live demo to see how it works. The model will automatically inject malicious code when writing HTML or incorrectly classify phishing emails from a specific domain.

Show HN: BadSeek – How to backdoor large language models

Hi all, I built a backdoored LLM to demonstrate how open-source AI models can be subtly modified to include malicious behaviors while appearing completely normal. The model, "BadSeek", is a modified version of Qwen2.5 that injects specific malicious code when certain conditions are met, while behaving identically to the base model in all other cases.<p>A live demo is linked above. There's an in-depth blog post at <a href="https://blog.sshh.io/p/how-to-backdoor-large-language-models" rel="nofollow">https://blog.sshh.io/p/how-to-backdoor-large-language-models</a>. The code is at <a href="https://github.com/sshh12/llm_backdoor">https://github.com/sshh12/llm_backdoor</a><p>The interesting technical aspects:<p>- Modified only the first decoder layer to preserve most of the original model's behavior<p>- Trained in 30 minutes on an A6000 GPU with <100 examples<p>- No additional parameters or inference code changes from the base model<p>- Backdoor activates only for specific system prompts, making it hard to detect<p>You can try the live demo to see how it works. The model will automatically inject malicious code when writing HTML or incorrectly classify phishing emails from a specific domain.

Show HN: BadSeek – How to backdoor large language models

Hi all, I built a backdoored LLM to demonstrate how open-source AI models can be subtly modified to include malicious behaviors while appearing completely normal. The model, "BadSeek", is a modified version of Qwen2.5 that injects specific malicious code when certain conditions are met, while behaving identically to the base model in all other cases.<p>A live demo is linked above. There's an in-depth blog post at <a href="https://blog.sshh.io/p/how-to-backdoor-large-language-models" rel="nofollow">https://blog.sshh.io/p/how-to-backdoor-large-language-models</a>. The code is at <a href="https://github.com/sshh12/llm_backdoor">https://github.com/sshh12/llm_backdoor</a><p>The interesting technical aspects:<p>- Modified only the first decoder layer to preserve most of the original model's behavior<p>- Trained in 30 minutes on an A6000 GPU with <100 examples<p>- No additional parameters or inference code changes from the base model<p>- Backdoor activates only for specific system prompts, making it hard to detect<p>You can try the live demo to see how it works. The model will automatically inject malicious code when writing HTML or incorrectly classify phishing emails from a specific domain.

Show HN: Immersive Gaussian Splat experience of Sutro Tower, San Francisco