SterJo Netstalker is described as 'SterJo NetStalker is innovative and FREE security software able to detect all authorized and unauthorized connections to your computer and send you alert for each new connection' and is a Firewall in the security & privacy category. There are more than 10 alternatives to SterJo Netstalker for a variety of platforms, including Windows, Linux, Mac, Android and iPhone apps. The best SterJo Netstalker alternative is Portmaster, which is both free and Open Source. Other great apps like SterJo Netstalker are simplewall, RethinkDNS, Fort Firewall and Little Snitch.