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Agent Skills is a collection of production-grade engineering skills by Addy Osmani, designed so AI coding agents follow senior engineering workflows consistently across every phase of development. Seven slash commands map to the full development lifecycle: /spec — Define what to build with requirements and acceptance criteria /plan — Break work into small, atomic, verifiable tasks /build — Implement incrementally, one slice at a time /test — Prove it works with failing tests first /review — Five-axis code review before merge /code-simplify — Clarity over cleverness /ship — Pre-launch checklist, monitoring, rollback plan The collection includes 19 skills covering the full engineering lifecycle — from spec-driven development and TDD through security hardening, performance optimisation, and deployment — plus three dedicated agent personas (code reviewer, security auditor, test engineer) that run as subagents for structured, formatted review passes. ...

Hoarder is an open-source “Bookmark Everything” app that uses AI for automatically tagging the content you throw at it. The app is built with self-hosting as a first-class citizen, making it a powerful solution for organizing and retrieving your digital content. Key features: AI-powered automatic content tagging Self-hosted solution for privacy and control Comprehensive documentation and setup guides Bookmark management with advanced organization Content search and retrieval Mobile-friendly interface Version tracking (current: v0.22.0) Open-source community support Whether you’re just getting started with Hoarder or looking to optimize your existing workflows, the documentation site offers valuable insights and practical guidance. The well-structured content makes it easy to find exactly what you need, from basic concepts to advanced techniques. ...

IT-Tools is a comprehensive collection of handy utilities for developers, offering a wide range of tools with a focus on excellent user experience. This open-source project provides developers with essential utilities all in one place, eliminating the need to search for individual tools across the web. Key features: Crypto Tools: Token generators, hash text utilities, encryption/decryption tools, password strength analyzers Converters: Various data format conversion utilities Generators: UUID/ULID generators, mock data creators Formatters & Validators: Code formatters, JSON/XML validators Web Development: CSS/HTML utilities, color pickers, responsive design tools Network Tools: IP lookup, DNS information, HTTP request testing Text Manipulation: String encoders/decoders, diff viewers, regex testers Clean, Intuitive UI: Well-organized categories with a modern interface Dark/Light Mode: Support for different visual preferences Completely Free: Open-source project with GPL-3.0 license Whether you’re working on frontend development, backend systems, or just need quick access to common developer utilities, IT-Tools provides a centralized platform with a consistent, user-friendly interface. The project is actively maintained and has gained significant popularity with over 27,000 stars on GitHub. ...

Mailpit is a small, fast, low memory, zero-dependency, multi-platform email testing tool and API designed specifically for developers. It serves as an essential utility for testing email functionality in applications without sending actual emails to recipients. Key features: SMTP Server: Acts as a local SMTP server that captures outgoing emails from your application Modern Web UI: Provides a clean, intuitive interface to view and inspect captured emails Advanced Search: Powerful filtering capabilities to find specific messages Message Management: Options for tagging, deleting, and organizing test emails HTML Inspection: Tools to check HTML content, links, and render emails Spam Analysis: Evaluate how email clients might classify your messages HTML Screenshots: Capture how emails would appear in various clients API Integration: Comprehensive API for automated testing workflows Import/Export: Capabilities for saving and loading test messages Multi-platform Support: Works across different operating systems Zero Dependencies: Lightweight installation with minimal requirements Whether you’re developing a simple contact form or a complex email notification system, Mailpit provides the tools needed to test and debug email functionality efficiently. By capturing all outgoing emails in a local environment, it eliminates the risk of accidentally sending test emails to real users while providing comprehensive inspection capabilities. ...

MindsDB is a powerful platform that connects AI to enterprise data, enabling organizations to make their data intelligent and responsive. It serves as an AGI data solution that bridges the gap between AI capabilities and existing database systems, allowing for real-time, informed decision-making across the enterprise. Key features: AI-Database Integration: Connect AI directly to your existing databases and data sources Natural Language Querying: Ask questions about your data in plain English and get AI-powered responses ...

CyberChef is a powerful web application developed by GCHQ (UK Government Communications Headquarters) that serves as a versatile tool for various “cyber” operations. It runs entirely in your web browser, allowing you to perform a wide range of data manipulation tasks without installing any software or sending your data to external servers. Key features: Simple encoding and decoding (Base64, URL encoding, ASCII85, etc.) Complex encryption and decryption (AES, DES, Blowfish, RSA) Data format conversion and transformation Compression and decompression of data Hash calculation and verification (MD5, SHA, HMAC) Network operations (IPv6 parsing, X.509 certificate analysis) Character encoding manipulation “Magic” operation for automatic detection of encoded data Intuitive drag-and-drop interface for creating operation sequences Ability to save and share operation “recipes” Contextual help system (hover and press F1) Whether you’re a cybersecurity professional analyzing suspicious data, a developer working with different encodings, or just someone who needs to manipulate data occasionally, CyberChef provides an accessible and comprehensive toolkit for your needs. Its browser-based nature makes it particularly useful for quick tasks without the need for specialized software. ...

Here’s a powerful terminal productivity tip that can save you time when working with command history: Instead of using the up/down arrow keys to scroll through your command history, you can use Ctrl + R to perform a reverse history search. This allows you to: Type any part of a previous command to quickly find it Search through long, complex commands efficiently Navigate large command histories with ease Quickly re-run or edit previous commands This is particularly useful when: ...

Cline is a VSCode extension that brings AI-powered development assistance directly into your editor. Unlike cloud-based solutions, Cline runs locally and integrates deeply with your development environment, providing contextual assistance while maintaining privacy and security. Key features: Local AI execution for privacy and speed Deep VSCode integration File system awareness and manipulation Built-in browser automation capabilities Extensible tool system Project-specific configuration Support for multiple AI models Context-aware code suggestions Automated task execution Custom command creation What sets Cline apart is its ability to not just suggest code, but to actively help implement solutions through its powerful tool system. It can read and write files, execute commands, search codebases, and even automate browser interactions, all while maintaining a conversation about your development needs. ...

n8n is a powerful workflow automation platform that allows you to connect various services and automate tasks without writing code. It provides a visual interface for creating workflows, with support for 200+ integrations including popular services like GitHub, Notion, Google Workspace, and more. Key features: Visual workflow builder with an intuitive interface Self-hosted option for complete data control Fair-code licensed, ensuring transparency and user rights Extensive API integrations Custom function nodes for advanced automation Webhook support for real-time automation Error handling and retry mechanisms Conditional logic and complex workflow patterns Whether you’re automating business processes, connecting different services, or building complex data pipelines, n8n provides the flexibility and power needed for modern workflow automation. ...

Portainer is a powerful container management tool that simplifies working with Docker, Docker Swarm, and Kubernetes. It provides an intuitive web interface that makes it easy to manage containers, images, networks, and volumes without needing to remember complex command-line instructions. Key features: User-friendly web interface for container management Support for Docker, Docker Swarm, and Kubernetes Role-based access control for team environments Container template library for quick deployments Stack management with docker-compose support Built-in monitoring and logging SSL/TLS security with Let’s Encrypt integration Multi-node cluster management Registry management for private and public images Resource usage monitoring and alerts Available in both Community Edition (CE) and Business Edition (BE), Portainer makes container orchestration accessible to everyone from hobbyists to enterprise teams. ...