OneNote Online - OneNote Online, part of Office Online, is the online version of Microsoft OneNote.
TiddlyWiki - a non-linear personal web notebook
OneNote - Get the OneNote app for free on your tablet, phone, and computer, so you can capture your ideas and to-do lists in one place wherever you are. Or try OneNote with Office for free.
wikidPad - wikidPad is an application for storing thoughts, ideas, todo lists, contacts, or anything else that user can think of to write down.
DEVONthink - DEVONtechnologies develops DEVONthink, DEVONagent, and other Mac and iOS apps for document and information management and web research.
Knowledge Workshop - Learning Management Solutions provides innovative and reliable software for the knowledge worker.