Pre-requisites:

Netfilter/iptables: http://www.netfilter.org

OpenSSL: http://www.openssl.org

Source codes + User Manuals:

Sept 1, 2003
OPERAext 0.1 preliminary release: OPERAext-0.1pre.tar.bz2

Other Resources:

Implementation of VTRR scheduler by the original author of VTRR algorithm: http://www1.cs.columbia.edu/~cvaill/