TreeSheets combines spreadsheet tools, mind mappers, outliners, personal information managers, text editors and small database utilities into an all-in-one office application.
Evernote is a note management application that offers you a single place for the organization, easy input and quick retrieval of all types of notes and clippings.
Cherrytree for Windows, macOS, and Linux is a free hierarchical note-taking application featuring rich text and syntax highlighting, storing data in a single XML or SQLite file. Zero-dependency portable version is also available.
WatchMe is a feature-rich timer program that can be used to track time for a number of different tasks or events together or independently of one another.