I've written (and am maintaining) an extensive LDAP presentation covering OpenLDAP and integration with various services, including a couple of slide on GQ. This is an excellent LDAP browser.
For my LDAP presentation see ldapv3.pdf (ftp://kalamazoolinux.org/pub/pdf/ldapv3.pdf) hosted by the Kalamazoo Linux Users Group (http://www.kalamazoolinux.org/). (Kalamazoo, Mi. USA)
An open, cross-platform journaling program.
A scientific plotting package.