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Open-source tools & agent skills to build the things you’re paying for.

YaCy

Project4.1K

Self-hosted web and intranet search with a crawler and index

Added 2026-10-07
Replaces
GitHub

What you can build

  • Build a page that accepts a visitor query, sends it to a YaCy search interface, and presents returned results in a custom layout.
  • Build an adapter that maps an application's query inputs to a documented YaCy HTTP interface and transforms its response into the application's chosen output shape.
  • Build a tool that reads a file of search questions, submits them through YaCy interfaces, and writes a report grouping results by question.
  • Build a review tool that combines search questions and returned results with human relevance labels, then outputs a labeled evaluation file.
  • Build a companion inventory where staff record servers found with YaCy's network scanner, add owner notes, and produce a categorized list; entering findings is manual.

Try this prompt

Build an end-to-end batch search review tool for YaCy. Accept a user-maintained file of search questions, submit each query through a YaCy HTTP/XML or HTTP/JSON interface identified from its web interface, and present the returned results for human relevance labels. Save the original questions, responses, and labels to a review file so reruns do not discard prior work. Do not assume undocumented endpoints or response fields; document the interface details the user must supply.

Get started

  1. Choose a setup route

    For a source build, the README requires Java 17 or later and Ant. It also documents Docker as an option for running a ready-to-use package.

  2. Open the web interface

    After starting YaCy, open its administration interface in a browser at localhost:8090. The README says to change the default admin password after installation.

  3. Inspect available interfaces

    Some YaCy web pages provide XML/JSON versions through an API icon. The README also points to scripts in /bin that call the web interface.

License & notes

GPL-2.0-or-laterMost files are GPL-2.0-or-later; source/net/yacy/cora has a separate LGPL grant unless a file states otherwise. Running the software is not restricted by the GPL. Distribution of modified or derivative GPL works carries source and licensing obligations; private modification alone does not automatically require publication. Self-hosting requires compute and storage. The supplied documentation establishes no paid API or model costs and gives no infrastructure price estimates.

  • Self-hosting requires compute, storage, and administration; the supplied documentation gives no infrastructure cost estimates.
  • Most files are GPL-2.0-or-later, while source/net/yacy/cora has a separate LGPL grant. Check file notices and meet applicable obligations when distributing modified or combined works.
  • The README describes peer-network operation and local-index mode, but does not establish particular API schemas or commercial AI-search features.

Systematic Debugging

Agent skill296.2K

Investigates bugs, test failures, production incidents, performance problems, and build errors through root-cause investigation before proposing fixes, followed by pattern analysis, hypothesis testing, and verification.

Added 2026-10-07
Works with
Claude Code, Codex +5
GitHub

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code-review

Agent skill279K

Reviews code changes against both repository standards and the originating task specification, using parallel focused review passes.

Added 2026-10-07
Works with
Claude Code, Other hosts
GitHub

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accessibility

Agent skill274.6K

A cross-platform accessibility skill for auditing and implementing WCAG 2.2 AA patterns on web, iOS, and Android interfaces.

Added 2026-10-07
Works with
Claude Code, Codex
GitHub

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azure-pipelines

Agent skill193.6K

Project-specific procedures for queueing VS Code Azure DevOps builds, checking status and logs, and iterating on failures.

Added 2026-10-07
Works with
GitHub Copilot
GitHub

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Ollama

Project182.4K

Run open models on your machine and connect them to applications through a REST API.

Added 2026-10-07
Replaces
GitHub

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QA and Bug Fixing

Agent skill135.6K

Runs a tiered quality check for browser, API, CLI, background job, worker, and webhook behavior. Quick, Standard, and Exhaustive modes let a team choose severity coverage, while the workflow expects verified fixes and clear outcomes rather than a checklist alone.

Added 2026-10-07
Works with
Claude Code with gstack tools
GitHub

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ui-ux-pro-max

Agent skill133.7K

Design reference system provides searchable UI styles, palettes, typography, charts and stack-specific implementation guidance.

Added 2026-10-07
Works with
Claude Code, Cursor +2
GitHub

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shadcn

Agent skill125.2K

Manages shadcn/ui components and projects by adding, searching, styling, debugging, and composing registry components.

Added 2026-10-07
Works with
Agent Skills-compatible hosts
GitHub

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Browser Use

Agent skill117.4K

Guides an agent using Browser Use for interactive browser automation, scraping, screenshots, testing, and site work through Chrome’s CDP, with explicit choices between local Chrome and remote browsers.

Added 2026-10-07
Works with
Codex
GitHub

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D3

Project113.8K

A low-level JavaScript toolkit for custom, data-driven graphics in SVG, Canvas, and HTML.

Added 2026-10-07
Replaces
GitHub

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Supabase

Project111.2K

Build Postgres-backed apps with authentication, APIs, realtime, storage, and functions.

Added 2026-10-07
Replaces
GitHub

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Whisper

Project110.1K

Build speech transcription, language identification, and translation workflows with an open-source model.

Added 2026-10-07
Replaces
GitHub

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FastAPI

Agent skill102.9K

Applies FastAPI conventions to API work involving Pydantic models, dependency injection, streaming, routing, response models, observability, and serving built frontend assets. Its quick reference routes tasks to focused documentation, helping agents use framework-native patterns rather than inventing them.

Added 2026-10-07
Format
SKILL.md
GitHub

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API and interface design

Agent skill102.3K

A detailed engineering workflow for designing stable APIs and module boundaries, with attention to backward compatibility, contracts, validation, and consumer expectations.

Added 2026-10-07
Works with
Claude Code, Cursor +3
GitHub

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Ecommerce Image Workflow

Agent skill99.8K

Creates a three-image ecommerce set from an uploaded product photo: a clean main packshot, a feature image, and a lifestyle scene. It locks product identity details before prompting, then records the inputs, aspect ratios, outputs, and fidelity notes in a manifest with an HTML preview gallery.

Added 2026-10-07
Works with
Claude Code (repository positioning; skill uses image-generation capability)
GitHub

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Playwright

Project97.2K

Build cross-browser end-to-end tests and browser automation scripts with one API.

Added 2026-10-07
Replaces
GitHub

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Puppeteer

Project95.7K

Build JavaScript workflows that control Chrome or Firefox.

Added 2026-10-07
Replaces
GitHub

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design-taste-frontend

Agent skill93.3K

A design-direction skill for landing pages and portfolios that guides brief interpretation, audit-first redesigns, and visual refinement.

Added 2026-10-07
Works with
Codex, Cursor +1
GitHub

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Uptime Kuma

Project92.2K

Self-hosted checks for websites, network services, DNS, containers, and push monitors.

Added 2026-10-07
Replaces
GitHub

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PaddleOCR

Project90.7K

Build OCR and document-parsing workflows that turn images and PDFs into structured data.

Added 2026-10-07
Replaces
GitHub

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Mermaid

Project90.6K

Create editable diagrams from Markdown-inspired text for documentation and JavaScript applications.

Added 2026-10-07
Replaces
GitHub

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Open guide

Syncthing

Project89.2K

Synchronize files between two or more computers, then adapt local workflows around those folders.

Added 2026-10-07
Replaces
GitHub

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Open guide

frontend-design

Agent skill83.5K

Frontend design guidance for producing distinctive production web interfaces rather than generic component layouts.

Added 2026-10-07
Works with
Claude Code, Codex
GitHub

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Netdata

Project80.8K

Open-source, real-time infrastructure monitoring with per-second metrics, anomaly detection, and alerting.

Added 2026-10-07
Replaces
GitHub

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Hoppscotch

Project80.6K

Develop APIs with reusable requests, collections, environments, and response tests.

Added 2026-10-07
Replaces
GitHub

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A product-specific review process for assessing Archify issues, pull requests, and code against user value, engineering cost, and expected impact.

Added 2026-10-07
Works with
Claude Code, Codex
GitHub

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Impeccable

Agent skill78K

Improves browser-rendered interfaces through separate design modes for audit, critique, polish, clarify, adapt, animate, and harden, with guidance on visual hierarchy, layout, typography, and implementation quality.

Added 2026-10-07
Works with
Claude Code, Codex +1
GitHub

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Grafana

Project77.1K

Query, visualize, and alert on telemetry across data sources.

Added 2026-10-07
Replaces
GitHub

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Tesseract OCR

Project76.8K

An open-source OCR engine for extracting text from images and building document workflows.

Added 2026-10-07
Replaces
GitHub

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Apache Superset

Project75.1K

Explore SQL data, build visualizations, and create dashboards with an extensible open-source BI platform.

Added 2026-10-07
Replaces
GitHub

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Creates and optimizes GitHub Actions pipelines with a constrained agent profile that limits file scope and operation budget and requires approval for production deployment, secret changes, and permission modifications.

Added 2026-10-07
Works with
Claude Code, Codex
GitHub

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career-ops

Agent skill73.7K

A local-first job-search command center routes across workflows for evaluating roles, tailoring CVs and tracking applications.

Added 2026-10-07
Works with
Claude Code, Codex +1
GitHub

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reveal.js

Project72.4K

An open-source HTML presentation framework for building browser-based slide decks.

Added 2026-10-07
Replaces
GitHub

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Vaultwarden

Project68.6K

Self-hosted Bitwarden-compatible server for personal and organization password vaults.

Added 2026-10-07
Replaces
GitHub

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Docling

Project68.5K

Convert diverse documents and media into structured content for tools you build.

Added 2026-10-07
Replaces
GitHub

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Apache ECharts

Project67.5K

Build interactive, customizable charts for browser applications.

Added 2026-10-07
Replaces
GitHub

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Tests authorized REST, GraphQL, or gRPC APIs for OWASP API risks such as object-level authorization, excessive data exposure, function authorization, SSRF, and injection, then validates findings with request evidence.

Added 2026-10-07
Works with
Agent Skills-compatible coding agents (host list not explicit in pinned files).
GitHub

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AnythingLLM

Project66.8K

Build a desktop or self-hosted AI workspace for document chat, agents, and recurring tasks.

Added 2026-10-07
Replaces
GitHub

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Docusaurus

Project66.4K

Build and customize websites for project documentation, blogs, and support pages.

Added 2026-10-07
Replaces
GitHub

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Prometheus

Project66.4K

Collect, query and alert on metrics from your services and systems.

Added 2026-10-07
Replaces
GitHub

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