Open Apps is built around a simple complaint: teams pay a recurring "SaaS tax" for tools that open-source projects already cover, but choosing an open-source replacement is risky because maintenance, code quality and dependency problems are hard to assess quickly. Its answer is a scoring system. Every app and package gets three independent ratings — repo health pulled from GitHub signals such as activity, maintenance and momentum; a separate technical score covering architecture, code quality and learning curve; and a dependency-health score that examines staleness, footprint and known vulnerabilities via OSV.dev.
The directory covers roughly 735 curated apps and thousands of packages, and maps 251 commercial SaaS products to open-source alternatives. Categories span developer tools, AI development and AI agents, databases, DevOps, monitoring, analytics, CMS, CRM, project management and more. Each app page links the project to its category and the alternatives it can replace, and the site publishes its methodology so the scoring can be audited and repeated.
Beyond the catalogue, Open Apps runs research reports and an insights section with aggregate data such as total GitHub stars and contributors, a blog of open-source takes, and an optional paid stack-audit service that recommends what a company could migrate and what it would cost. It is an independent project — not affiliated with the vendors listed — funded partly through community support.
