Show HN Daily Selection (2025-04-09)
- Coroot – eBPF-based, open source observability with actionable insights
- HNSW index for vector embeddings in approx 500 LOC
- Connecting an IBM 3151 terminal to a mainframe [video]
- Badgeify – Add Any App to Your Mac Menu Bar
- A website/app to help manage your game library
- I built a tool to find devs based on code, not LinkedIn titles
- Chat with any GitHub repository via MCP
- Zev – Remember (or discover) terminal commands
- Timi – CLI Time Tracker
- I made yet another AI chat bot because I hate monthly subscriptions
- Defense Jobs EU Job Board
- MCPGen – API to MCP Server Generator
- ElevenLabs MCP server
- Three Kind Words – Spread kindness one mysterious postcard at a time
Coroot – eBPF-based, open source observability with actionable insights [Developer Tools]
77 points, 14 comments
Coroot is an open-source, eBPF-based observability tool that automates telemetry collection and provides actionable insights to simplify system monitoring.
- Cost monitoring for AWS, GCP, and Azure to optimize cloud expenses
- SLO tracking with anomaly detection and baseline comparison
- One-click application profiling to identify problematic code
- Mapped timeframes for easy incident investigation
- eBPF-powered automatic log, metric, trace, and profile collection
- Service map for a high-level system overview
- Kubernetes cluster deployment auto-discovery and monitoring
Discussion Link, Original Link
HNSW index for vector embeddings in approx 500 LOC [Developer Tools]
52 points, 8 comments
HNSW index implementation for vector embeddings in approximately 500 lines of code.
- Lightweight implementation (~500 LOC)
- Supports approximate nearest neighbor search
- Optimized for vector embeddings
Discussion Link, Original Link
Connecting an IBM 3151 terminal to a mainframe [video] [Consumer Tech]
115 points, 37 comments
A C program translates protocols to connect an IBM 3151 terminal to a mainframe, enabling form-based input like 3270 terminals.
- Supports both character mode and block mode for input/output
- Translates between 3270 and 3151 terminal protocols
- Includes a demo video and open-source code on GitHub
- Works with emulated mainframes on vintage hardware
Discussion Link, Original Link
Badgeify – Add Any App to Your Mac Menu Bar [Productivity]
88 points, 43 comments
Add any app to your Mac menu bar for quick access.
- Customizable menu bar integration
- Supports any application
- Easy setup and usage
Discussion Link, Original Link
A website/app to help manage your game library [Entertainment]
22 points, 31 comments
A website and mobile app to help users manage their game library, similar to MyAnimeList but for games.
- Open-source project developed over a year
- Basic features with gradual expansion based on user feedback
- Supports importing games from Steam/PSN
- Includes a "Posts" feature for user interaction
- No ads or subscriptions, purely a hobby project
Discussion Link, Original Link
I built a tool to find devs based on code, not LinkedIn titles [Developer Tools]
80 points, 66 comments
GitMatcher helps recruiters and founders find developers based on their actual GitHub code instead of resumes or LinkedIn titles.
- Analyzes public GitHub repos and commit history
- Evaluates originality and usefulness of code
- Identifies patterns showing real skill and consistency
- Useful for recruiters, founders, and OSS maintainers
- Focuses on code quality over keywords or job titles
Discussion Link, Original Link
Chat with any GitHub repository via MCP [Developer Tools]
4 points, 1 comments
Chat with any GitHub repository using MCP.
- Interact with GitHub repositories via chat
- Powered by MCP technology
Discussion Link, Original Link
Zev – Remember (or discover) terminal commands [Developer Tools]
5 points, 1 comments
A tool to help users remember or discover terminal commands by suggesting options and copying the selected command to the clipboard.
- Helps recall forgotten terminal commands
- Suggests multiple command options based on user input
- Automatically copies the selected command to the clipboard
Discussion Link, Original Link
Timi – CLI Time Tracker [Productivity]
3 points, 0 comments
CLI Time Tracker
- Command-line interface for time tracking
- Simple and lightweight tool
Discussion Link, Original Link
I made yet another AI chat bot because I hate monthly subscriptions [ChatBots]
5 points, 0 comments
A pay-as-you-go AI chat bot that avoids monthly subscriptions by combining multiple AI services into one interface.
- Pay-as-you-go model instead of monthly subscriptions
- Combines multiple AI services into a single chat interface
- Built with NextJS, TypeScript, MongoDB, and OpenAI API
- Features token conversion math for competitive pricing
- Hosted on Hostinger with Coolify
Discussion Link, Original Link
Defense Jobs EU Job Board [Business]
3 points, 2 comments
A job board for defense startups in the EU due to increased defense investments.
- Curates job opportunities in the EU defense sector
- Focuses on startups in the defense industry
- Open to submissions from industry professionals or startups
Discussion Link, Original Link
MCPGen – API to MCP Server Generator [Developer Tools]
3 points, 0 comments
API to MCP server generator that converts API documents into MCP servers.
- Converts API documents to MCP servers
- Simplifies server setup from API specs
- Automates MCP server generation
Discussion Link, Original Link
ElevenLabs MCP server [ChatBots]
4 points, 0 comments
ElevenLabs MCP server enables Claude and Cursor to access the ElevenLabs API via text prompts.
- Allows ordering services like pizza via text prompts
- Integrates ElevenLabs API with Claude and Cursor
- Demonstrated with a real-world use case (ordering pizza)
Discussion Link, Original Link
Three Kind Words – Spread kindness one mysterious postcard at a time [Life Assistant]
8 points, 4 comments
A service that anonymously sends three postcards over three weeks to reveal a kind message.
- Sends three-word messages split across postcards mailed weekly
- Anonymous until the final card arrives
- Built with Cloudflare Workers, Hugo, Stripe, and PostGrid API
- $5 for three postcards, including postage
- US-only currently, with plans to expand
- Features like Mother’s Day Button and Display Name Override
- Privacy-focused with data deletion after 60 days