GQ is an LDAP client based on GTK+/GTK2
Great tool - although lacking in internal help, also seems somewhat abandoned. However, I found a recently (2013) packaged RPM, with version 1.3.4 that installed on Fedora 20 w/o issues. (gq-1.3.4-19.fc20.x86_64). It has been helpful and its existence highly appreciated. I also use luma.