Instiki
Ruby On Rails

Current versions
0.19.3: ZIP | TGZ

Instiki source

About
Installation
Markup Choices
Syntax

Mail list
Forum
GitHub
Report a Bug

Sandboxes
Play around with Instiki:
Textile | Markdown | RDoc

Key Features

Revisions
Follow or rollback any change to any page.

Exporting
Take the entire wiki home with you as HTML or markup rolled up in a zip.

File Uploads
Easily upload images, videos, or other files, and manage previously-uploaded files.

Internationalization
CamelCase WikiWords are supported- in Latin, Greek, Cyrillic, and Armenian characters. BracketStyle wiki words work in all languages.

Atom feeds
Know when content is added.

Markup choices
Write wiki pages in Textile, Markdown or RDoc.

More: Instiki Features