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.
DokuWiki - DokuWiki is a simple to use and highly versatile Open Source wiki software that doesn't require a database.
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.
Wiki.js - An open source, modern and powerful wiki app built on Node.js, Git, and Markdown.
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.
TiddlyWiki - a non-linear personal web notebook