Phorum and AEF if you want to try something new and better (in my opinion).
Softaculous - Auto Installer for cPanel, Direct Admin, InterWorx, Plesk, H-Sphere
The only Auto Installer that installs 260+ scripts. Install in just ONE STEP! Virtualizor - VPS Control Panel supporting OpenVZ, Xen, KVM and has 60+ OS Templates
Webuzo - Softaculous for the Cloud i.e. Softaculous Standalone
They have recently released v2 that's built around their own PHP5 framework called Garden. It's still early in development but looks like a promising architecture that's based on a plug-in/module system.