The golden age of open directories (early 2000s) has faded due to security and copyright enforcement. However, they persist in three main forms:
As cloud storage becomes cheaper, some organizations are returning to static HTTP indexes for their simplicity, speed, and zero-bloat interface.
If you stumble upon a public "index of software iso work":
The "index" of work in ISO 12207 is divided into four major categories. Every action in software development—from writing code to managing servers—falls into one of these four buckets: