There are many tools and technologies that can help you to classify and index your documents. For example, Microsoft SharePoint is a web-based platform that allows you to store, manage, and share documents and other information. You can use SharePoint to create libraries, folders, and metadata columns for classification, as well as views, filters, and search scopes for indexing. Adobe Acrobat is a software that allows you to create, edit, and convert PDF documents. You can use Acrobat to add properties, bookmarks, and tags for classification, as well as indexes, catalogs, and portfolios for indexing. Evernote is a cloud-based service that allows you to capture, organize, and access notes, documents, and other information. You can use Evernote to create notebooks, stacks, and tags for classification; additionally you can utilize keywords, search operators, and shortcuts for indexing.