Personal Information Management (PIM) & Personal Knowledge Management (PKM)
Personal Information Management (PIM) is the study and implementation of systems for creating, storing, organizing, maintaining, retrieving, and using information for personal use. Personal Knowledge Management (PKM) could be considered a subdomain of PIM. Personal Knowledge Management Systems (PKMS) are systems to facilitate the above.
Org Mode
A built-in document format and set of accompanying tooling in Emacs for managing information and notes. Outside of the tree-like structure of the documents, lacks any specific structure to facilitate a PKMS.