sdd — independent software & tools

6 independent sdd listings the big search engines bury.

• devspec

  github · Free · by speclabs

  Enterprise-ready spec-driven development framework that helps software teams and technical leaders standardize AI-assisted delivery across architecture, planning, implementation, review, governance, and recovery.

• @planu/cli

  npm · Free · by planudev

  Planu — MCP Server for Spec Driven Development. Cross-platform (Linux/macOS/Windows, x64/arm64).

• SpecPilot

  github · Free · by girishr

  Spec-driven development (SDD) CLI for AI coding agents (Claude Code, Cursor) - initialize, validate, and sync .specs/ across TypeScript & Node.js projects

• openspec-webui

  github · Free · by oioi555

  Interactive browser UI for browsing and managing OpenSpec specifications

• specscore

  github · Free · by specscore

  Open standard for AI-readable software specifications — Markdown+YAML features, requirements, acceptance criteria, plans and tasks, validated by CI lint

• codexspec

  github · Free · by Zts0hg

  A Requirements-First Spec-Driven Development (SDD) toolkit for Codex and Claude Code with multi-language support