pidgin from GNOME:Apps:pidgin-sipe project
Select Your Operating System
Add repository and install manually
For RHEL 5 run the following as root:
cd /etc/yum.repos.d/ wget https://download.opensuse.org/repositories/GNOME:Apps:pidgin-sipe/RHEL_5/GNOME:Apps:pidgin-sipe.repo yum install pidgin