DokuWiki - DokuWiki is a simple to use and highly versatile Open Source wiki software that doesn't require a database.
ShareAccount - Share your account without giving out your password
Wiki.js - An open source, modern and powerful wiki app built on Node.js, Git, and Markdown.
Notopass - Share your accounts without giving username/password
TiddlyWiki - a non-linear personal web notebook
XWiki - A powerful Open Source collaborative platform enhancing collaboration and communication.