Reference material, not a description of it.
Organized by what it actually documents — the commercial platform, how to build against it, and how OSG governs itself — rather than one blended list.
The four Institutional documents are authored and canonical here. Platform and Developer documentation point to the platform repository, which is the canonical source for that material — a copy here would drift out of sync with the actual codebase. The Engineering and Research pages elsewhere on this site summarize related institutional material for a general reader; where they differ in detail from a document here, this page is binding.
The commercial platform's capabilities and architecture, maintained in its own repository.
API reference and setup, maintained in the platform repository.
OSG's own governance and decision-making standards, authored here.