W2 by Steven Frank

A web-based, wiki-like notepad that you host yourself.

Notable features:

• Written in PHP for portability and hackability
• Uses Markdown syntax for formatting notes
• Fits to screen nicely when viewed on iPhone, with custom icon for adding to home screen
• Use double-brackets [[like this]] to link to another note by title
• Title & content search
• Filesystem storage (no database)
• Plaintext storage
• Image attachment uploading
• Public or password-protected
• Unlike cloud / hosted solutions, you retain control of your data

Demo

See a sample W2 installation

Source

To check out the latest source:

svn checkout http://w2wiki.googlecode.com/svn/trunk/ w2wiki

Forum

http://groups.google.com/group/w2wiki