This application installs OpenVPN 2.1.1 into /system/bin, /system/xbin or /system/xbin/bb after checking if a suitable BusyBox installation is available. It also symlinks ifconfig and route to /system/xbin/bb if necessary.
To use OpenVPN you will also need the TUN/TAP kernel module (tun.ko), which is not installed by this application.
Since some other OpenVPN binaries and installers didn't work for me, I decided to write my own installer. This installer checks some prerequisites and warns if some are missing.