Total Commander - A Shareware file manager for Windows® 95/98/ME/NT/2000/XP/Vista/7, and Windows® 3.1.
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
Path Finder - The Finder, reinvented. Path Finder is an award-winning file browser and management application for Mac OS X.
Joplin - Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.
Dolphin File Manager - Dolphin is a file manager for KDE focusing on usability.
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.