Which systems digitize, index, and tag documents according to a coherent framework?

Document management systems are specifically designed to handle the storage, organization, and retrieval of documents in a digital format. They provide functionality to digitize physical documents, index them for easy searching, and tag them with relevant metadata that helps classify and organize the information according to a coherent framework. This structured approach streamlines document handling and ensures that users can efficiently find and manage the information they need.

In contrast, wikis are collaborative platforms for creating and sharing information but do not inherently focus on document organization in the same way. CAD software is primarily used for computer-aided design, focusing on creating and modifying design drawings rather than managing documents. Learning Management Systems (LMS) are designed to deliver, track, and manage educational courses but also do not primarily focus on the digitization and indexing of general documents. Therefore, document management systems clearly fit the description provided in the question.