Advanced Policy Firewall vs Spybot – Search & Destroy

Advanced Policy Firewall is a free GNU GPL firewall system for Internet-deployed Linux servers. It uses iptables/netfilter to combine static rules, stateful connection policies, and checks for attack patterns and forged source addresses. Administrators can configure granular inbound and outbound filtering, including rules based on users and applications. Additional controls include reactive address blocking, GeoIP country filtering, and Spamhaus and DShield lists. IPv6 dual-stack filtering can create ip6tables rules automatically. Documentation describes snapshots loading more than 1,000 rules in under one second, plus integrations with BFD, cron, systemd, Docker/Kubernetes, and logrotate. APF requires Linux, iptables/netfilter, and Bash, and supports legacy and nft backends. Listed systems include RHEL/Rocky/AlmaLinux 8 and 9, CentOS 6 and 7, Debian 12, and Ubuntu 12.04, 20.04, and 24.04. Development mode initially flushes the firewall every five minutes; only SSH port 22 is open by default.

Spybot – Search & Destroy is Windows security software focused on finding and removing spyware, adware, tracking software, keyloggers and other unwanted software. Its Free Edition includes anti-spyware scanning and removal, a rootkit scan, System Immunization and Startup Tools, for private, non-commercial use; the private-use license does not cap device count. System Immunization blocks access to sites associated with malicious or unwanted software, tracking cookies and browser plugins identified as malware. The maker lists Internet Explorer, Opera, Firefox and Chrome for that feature. Rootkit Scan checks the file system, registry and process-related lists. Paid editions list features including automatic signature downloads multiple times per day and task scheduling. Live Protection monitors newly created and running processes and blocks malicious processes before they start. Command-line tools cover scans, immunization, cleaning and updating, with use in scripts and scheduled tasks described by the maker. The product page also describes FileAlyzer for file analysis and RegAlyzer for browsing and changing the registry. Startup Tools can alter registry and other system settings, so the maker advises care.