Free tool comparing 59 proprietary SaaS tools to open-source alternatives. Features a savings calculator (enter team size → see exact savings), self-hosting difficulty scores, AI verdicts, and step-by-step migration guides. Covers design, dev tools, project management, communication & more. Updates daily via GitHub Actions. Infrastructure cost: $0/month. Top picks: Figma vs Penpot · Slack vs Mattermost · Adobe vs Inkscape