specs.md
Free open-source alternative with VS Code extension support and compatibility with any IDE or AI agent.
BMAD
Free open-source tool focused on agentic agile workflows, compatible with any IDE or AI agent.
OpenSpec
Free open-source toolkit focused on brownfield projects and compatible with AGENTS.md specifications.
Kiro
Partially open-source but IDE-locked with paid tiers ranging from $20 to $200 per month.