Umlaut is OpenURL link resolving middleware that adds functions and services to commercial link resolving software such as SFX.
About Umlaut - A gentle introduction to what Umlaut is and what it can do for you.
Digital Text Features - A tour of some of the 'advanced' digital text features, with a demos pointing to JHU site, hosted on jrochkind's blog.
Rubyforge home page for developers
Live installation at JHU, base url is http://findit.library.jhu.edu/resolve
Installation and Configuration
Umlaut API Documentation
Umlaut Technical Overview
Umlaut Local Configuration Architecture
Umlaut URL parameters
Umlaut SFX statistics gotchas
Umlaut full API
Umlaut partial html API
JQuery HTML Updater
Notes for a User/Auth architecture