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[Other] Show HN: SubTrack – A SaaS tracker for devs that finds unused tools Hi HN,<p>I built SubTrack to help teams find unused SaaS tools and cloud resources before they silently eat into budgets.<p>The motivation came from seeing how hard it is to answer simple questions: – Which SaaS tools are actually used? – Which cloud resources are idle? – What will our end-of-month spend look like?<p>SubTrack connects to tools like AWS, GitHub, Vercel, and others to surface unused resources and cost signals from one place. Recently I added multi-account support, currency localization, and optional AI-based insights to help interpret usage patterns.<p>This is an early-stage project and I’m actively iterating. I’d really appreciate feedback—especially from people managing cloud or SaaS sprawl.

[API/SDK] Open-Meteo is a free and open-source weather API for non-commercial use

[CLI Tool] Show HN: Agent-of-empires: OpenCode and Claude Code session manager Hi! I’m Nathan: an ML Engineer at Mozilla.ai: I built agent-of-empires (aoe): a CLI application to help you manage all of your running Claude Code&#x2F;Opencode sessions and know when they are waiting for you.<p>- Written in rust and relies on tmux for security and reliability - Monitors state of cli sessions to tell you when an agent is running vs idle vs waiting for your input - Manage sessions by naming them, grouping them, configuring profiles for various settings<p>I&#x27;m passionate about getting self-hosted open-weight LLMs to be valid options to compete with proprietary closed models. One roadblock for me is that although tools like opencode allow you to connect to Local LLMs (Ollama, lm studio, etc), they generally run muuuuuch slower than models hosted by Anthropic and OpenAI. I would start a coding agent on a task, but then while I was sitting waiting for that task to complete, I would start opening new terminal windows to start multitasking. Pretty soon, I was spending a lot of time toggling between terminal windows to see which one needed me: like help in adding a clarification, approving a new command, or giving it a new task.<p>That’s why I build agent-of-empires (“aoe”). With aoe, I can launch a bunch of opencode and Claude Code sessions and quickly see their status or toggle between them, which helps me avoid having a lot of terminal windows open, or having to manually attach and detach from tmux sessions myself. It’s helping me give local LLMs a fair try, because them being slower is now much less of a bottleneck.<p>You can give it an install with<p>curl -fsSL <a href="https:&#x2F;&#x2F;raw.githubusercontent.com&#x2F;njbrake&#x2F;agent-of-empires&#x2F;main&#x2F;scripts&#x2F;install.sh" rel="nofollow">https:&#x2F;&#x2F;raw.githubusercontent.com&#x2F;njbrake&#x2F;agent-of-empires&#x2F;m...</a> | bash<p>Or brew install njbrake&#x2F;aoe&#x2F;aoe<p>And then launch by simply entering the command `aoe`.<p>I’m interested in what you think as well as what features you think would be useful to add!<p>I am planning to add some further features around sandboxing (with docker) as well as support for intuitive git worktrees and am curious if there are any opinions about what should or shouldn’t be in it.<p>I decided against MCP management or generic terminal usage, to help keep the tool focused on parts of agentic coding that I haven’t found a usable solution for.<p>I hit the character limit on this post which prevented me from including a view of the output, but the readme on the github link has a screenshot showing what it looks like.<p>Thanks!

[Other] Go-legacy-winxp: Compile Golang 1.24 code for Windows XP

[Other] Launch a Debugging Terminal into GitHub Actions

[CLI Tool] Show HN: ZCCInfo – Fast status line for Claude Code written in Zig Startup time is ~10ms with Zig, which is why I built this small CLI tool for Claude Code that shows context usage, git branch, and model info in the status line.<p>The original JavaScript version took ~143ms to start. Reducing this to ~10ms matters since the tool runs frequently during editor use.

[Other] Unauthenticated remote code execution in OpenCode Previous versions of OpenCode started a server which allowed any website visited in a web browser to execute arbitrary commands on the local machine. Make sure you are using v1.1.10 or newer; see link for more details.

[API/SDK] iMessage-kit is an iMessage SDK for macOS

[CLI Tool] CLI agents like Claude Code make self-hosting on a home server easier and fun

[Other] Show HN: Chr2 – consensus for side effects (exactly-once is a lie) Most consensus libraries (Raft, Paxos) treat the state machine as a pure black box. This is fine until your state machine needs to actually do something, like charge a credit card, fire a webhook, or send an email.<p>If a leader crashes after the side effect but before committing it, you get duplicates. This is my attempt at fixing this problem from first principles ish: build chr2 to make crash-safe side effects first-class citizens.<p>mechanism:<p>Replicated Outbox: Side effects are stored as &quot;pending&quot; in replicated state. Only the leader executes them under a fencing token.<p>Durable Fencing: A manifest persists the highest view using atomic tmp+fsync+rename. This ensures a &quot;zombie&quot; leader can&#x27;t wake up and double-execute stale effects.<p>Deterministic Context: Application code receives a deterministic RNG seed and block_time from the log, ensuring 1:1 state transitions during replay.<p>Strict WAL: Entries are CRC’d and hash chained. it is designed to prefer halting on mid-log corruption over guessing.<p>The Trade-offs: Side effects are intentionally at-least-once; &quot;exactly-once&quot; requires stable effect IDs for sink-side deduplication. It’s a CP system safety over availability.<p>Repo: <a href="https:&#x2F;&#x2F;github.com&#x2F;abokhalill&#x2F;chr2" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;abokhalill&#x2F;chr2</a><p>if you’ve ever had “exactly once” collapse the first time a leader died mid flight, you know exactly why I built this.

[CLI Tool] Show HN: A MCP for controlling terminal UI apps built with bubbletea and ratatui so you can start vibe-coding your ad-hoc terminal dashboard. With session replay and mouse click support built-in.

[Other] Show HN: I made a Tailwind alternative for Preact This is a small TailwindCSS alternative based on a css template literal. I was inspired by styled-components and EmotionCSS, which however do not work well with ViteJS and specifically Preact.<p>This provides a better experience than Tailwind, as you can use all CSS language features without learning new conventions while maintaining a per-component styling approach.<p>This also turns out to be more inspectable in the browser&#x27;s dev-tools, as snippets are extracted as-is and are not fragmented across thousands of small classes.<p>I wanted something more optimized than other CSS-in-JS alternatives that generate CSS at runtime, so I created a ViteJS plugin for this. It extracts all style snippets, replaces them with classes like css-a1b2c3, and injects all the corresponding styles into a CSS file in place of an &quot;@extracted-css&quot; directive.<p>There is also a preact options hook that adds a custom &quot;classList&quot; attribute, which maps to clsx for easy class composition (similarly to VueJS, Svelte, etc.).<p>P.S. I know other frameworks exist, but I have really been enjoying using Preact for frontend development lately.

[API/SDK] Show HN: pgwire-replication - pure rust client for Postgres CDC

[IDE/Editor] Show HN: Ferrite – Markdown editor in Rust with native Mermaid diagram rendering Ferrite: Fast Markdown&#x2F;Text&#x2F;Code editor in Rust with native Mermaid diagrams<p>Built a Markdown editor using Rust + egui. v0.2.1 just dropped with major Mermaid improvements:<p>→ Native Mermaid diagrams - Flowcharts, sequence, state, ER, git graphs - pure Rust, no JS<p>→ Split view - Raw + rendered side-by-side with sync scrolling<p>→ Syntax highlighting - 40+ languages with large file optimization<p>→ JSON&#x2F;YAML&#x2F;TOML tree viewer - Structured editing with expand&#x2F;collapse<p>→ Git integration - File tree shows modified&#x2F;staged&#x2F;untracked status<p>Also: minimap, zen mode, auto-save, session restore, code folding indicators.<p>~15MB binary, instant startup. Windows&#x2F;Linux&#x2F;macOS.<p>GitHub: <a href="https:&#x2F;&#x2F;github.com&#x2F;OlaProeis&#x2F;Ferrite" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;OlaProeis&#x2F;Ferrite</a><p>v0.2.2 coming soon with performance improvements for large files. Looking for feedback!

[Other] Show HN: Marten – Elegant Go web framework (nothing in the way)

[CLI Tool] Show HN: I used Claude Code to discover connections between 100 books I think LLMs are overused to summarise and underused to help us read deeper.<p>I built a system for Claude Code to browse 100 non-fiction books and find interesting connections between them.<p>I started out with a pipeline in stages, chaining together LLM calls to build up a context of the library. I was mainly getting back the insight that I was baking into the prompts, and the results weren&#x27;t particularly surprising.<p>On a whim, I gave CC access to my debug CLI tools and found that it wiped the floor with that approach. It gave actually interesting results and required very little orchestration in comparison.<p>One of my favourite trail of excerpts goes from Jobs’ reality distortion field to Theranos’ fake demos, to Thiel on startup cults, to Hoffer on mass movement charlatans (<a href="https:&#x2F;&#x2F;trails.pieterma.es&#x2F;trail&#x2F;useful-lies&#x2F;" rel="nofollow">https:&#x2F;&#x2F;trails.pieterma.es&#x2F;trail&#x2F;useful-lies&#x2F;</a>). A fun tendency is that Claude kept getting distracted by topics of secrecy, conspiracy, and hidden systems - as if the task itself summoned a Foucault’s Pendulum mindset.<p>Details:<p>* The books are picked from HN’s favourites (which I collected before: <a href="https:&#x2F;&#x2F;hnbooks.pieterma.es&#x2F;" rel="nofollow">https:&#x2F;&#x2F;hnbooks.pieterma.es&#x2F;</a>).<p>* Chunks are indexed by topic using Gemini Flash Lite. The whole library cost about £10.<p>* Topics are organised into a tree structure using recursive Leiden partitioning and LLM labels. This gives a high-level sense of the themes.<p>* There are several ways to browse. The most useful are embedding similarity, topic tree siblings, and topics cooccurring within a chunk window.<p>* Everything is stored in SQLite and manipulated using a set of CLI tools.<p>I wrote more about the process here: <a href="https:&#x2F;&#x2F;pieterma.es&#x2F;syntopic-reading-claude&#x2F;" rel="nofollow">https:&#x2F;&#x2F;pieterma.es&#x2F;syntopic-reading-claude&#x2F;</a><p>I’m curious if this way of reading resonates for anyone else - LLM-mediated or not.

[Database] Generate QR Codes with Pure SQL in PostgreSQL

[Other] Show HN: Porting xv6 to HiFive Unmatched board Hi HN,<p>I ported the teaching OS xv6-riscv to HiFive Unmatched and got it running on real hardware, including passing usertests.<p>I&#x27;ve been self-studying OS internals using the MIT 6.1810 materials. After finishing most of the labs, I was eager to see what it&#x27;s like to run the OS on bare metal, rather than QEMU.<p>The Unmatched may not have the latest RISC-V features, but it&#x27;s well-documented, and the Rev B release has made it more affordable, which makes it a good learning platform.<p>The porting process involved several interesting challenges:<p>- Hardware Quirks: Handling things like enabling A&#x2F;D bits in PTEs (the hardware doesn&#x27;t set them automatically, causing page faults), proper handling of interrupts, and instruction cache synchronization.<p>- Boot Flow: xv6 expects M-mode on startup, but standard RISC-V boot flows (typically via OpenSBI) jump to S-mode. To bridge this gap, I created a minimal U-Boot FIT image that contains only the xv6 kernel. This way, U-Boot SPL handles the complex CPU&#x2F;DDR initialization, then hands control to xv6 in M-mode (skipping OpenSBI).<p>- Drivers: Ported an SPI SD card driver, replacing the virtio disk driver.<p>I wrote up implementation notes here: <a href="https:&#x2F;&#x2F;github.com&#x2F;eyengin&#x2F;xv6-riscv-unmatched&#x2F;blob&#x2F;unmatched&#x2F;doc&#x2F;NOTES.md" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;eyengin&#x2F;xv6-riscv-unmatched&#x2F;blob&#x2F;unmatche...</a><p>Hopefully, this is useful for others who are learning OS internals and want to try running their code on real RISC-V hardware.

[Other] Bare metal programming with RISC-V guide (2023)

[Other] Show HN: I vibecoded an ARM64 operating system that boots on real hardware VibeOS is a retro operating system that boots on qemu and Pi Zero 2W. I built this with Claude code in about 4 weeks.