I'm wearing multiple hats on a current client engagement - one of which includes integrating several Open Source tools that are used by the Enterprise Architecture team I'm mentoring.
One of those tools is FlySpray - which as of the current release (0.9.9.5.1) does not support integration with LDAP.
A user of FlySpray submitted a bit of PHP code to the FlySpray development team that appears to provide LDAP integration capabilities...however, my client's environment appears to have some subtle difference that may require some tweaking of the code.
Here are a few useful LDAP references and tutorials:
Rutgers University lecture: Lightweight Directory Access Protocol (LDAP)
An LDAP Roadmap & FAQ
bind9.net LDAP Howto, LDAP Links, LDAP Whitepapers
Sun JNDI Tutorial: Tips for LDAP Users
OpenESB LDAP Tutorial
OpenLDAP Software 2.3 Administrator's Guide
YoLinux LDAP Tutorial: Deploying OpenLDAP
tutorialpoint.com Ruby/LDAP Tutorial
codehaus.org AcegiSecurity Plugin - LDAP Tutorial
grails.org AcegiSecurity Plugin - LDAP Tutorial
mozzila.org RFC Standards and Documents
LDAPman.org RFC Page
Graham Barr > perl-ldap > Net::LDAP::RFC