Opensource.Builders

Find open-source alternatives to popular software, compare features side-by-side, and generate skills with code references that help AI build those features in your project.

Features

• Browse Alternatives - Discover open-source alternatives to proprietary applications
• Compare Applications - See feature-by-feature comparisons between apps
• Skill Builder - Generate AI coding agent skills from curated features with implementation details and code references
• Multi-Agent Support - Install skills in Claude Code, Cursor, Droid, or Codex CLI

Skill Builder

The Skill Builder lets you select features from multiple open-source projects and generates a skill - a guide with specific code references that your AI coding agent can use to build those features in your project. Each skill includes:

• Feature descriptions and implementation notes
• Links to reference code in GitHub repositories
• Documentation URLs for deeper context

Installing Skills

After generating a skill, you can install it in your preferred AI coding agent:

Claude Code

# Save the skill file to your project
mkdir -p .claude/skills && cp ~/Downloads/SKILL.md .claude/skills/

Cursor

# Add the skill content to your rules file
cat ~/Downloads/SKILL.md >> .cursor/rules/skill.mdc

Droid

# Save to your project's skills directory
mkdir -p .factory/skills && cp ~/Downloads/SKILL.md .factory/skills/

Codex CLI

# Add to your agents instructions
cat ~/Downloads/SKILL.md >> codex.md

Getting Started

First, run the development server:

npm run dev
# or
yarn dev
# or
pnpm dev
# or
bun dev

Open http://localhost:3000 with your browser to see the result.

Tech Stack

• Next.js - React framework
• Keystone - Headless CMS
• PostgreSQL - Database
• Tailwind CSS - Styling

Contributing

See CONTRIBUTING_TO_OSB.md for guidelines on adding applications, capabilities, and improving the platform.

Deploy

Vercel

Railway

License

MIT