Fast configuration for Zevenet Community Edition APT repository:
1#
root@zevenetlb#> wget -O - http://repo.zevenet.com/zevenet.com.gpg.key | apt-key add -
2#
root@zevenetlb#> echo "deb http://repo.zevenet.com/ce/v4/ jessie main" >> /etc/apt/sources.list
3#
root@zevenetlb#> apt-get update
4#
root@zevenetlb#> apt-get install zevenet
More info here.