DokuWiki - DokuWiki is a simple to use and highly versatile Open Source wiki software that doesn't require a database.
Ardoq - Software Architecture Diagram Tool. Single platform for textual and visual documentation; Automatically generated diagrams based on data; Model driven .
Wiki.js - An open source, modern and powerful wiki app built on Node.js, Git, and Markdown.
BiZZdesign - Enterprise Architecture software that helps organizations dramatically increase the success rate of complex enterprise transformation, strategic investment allocation, and risk management.
TiddlyWiki - a non-linear personal web notebook
iServer365 by OrbusSoftware - The Next Generation SaaS Platform for Architecting Your Digital Future.