DokuWiki - DokuWiki is a simple to use and highly versatile Open Source wiki software that doesn't require a database.
Markdoc - Markdoc is a lightweight Markdown-based wiki system.
TiddlyWiki - a non-linear personal web notebook
Scribbleton - The little personal wiki.
Pepperminty Wiki - An entire wiki in a single PHP file. Intended for small - medium sized wikis.
Firepad - Open source collaborative code and text editing that relies on Firebase for real-time data...