We've been using Algosec as our reference tool to clean our policies from old unused rules and objects and to assess rules that are categorized as risky so that we can fix those risks.
Firewall Analyzer from Algosec is our main tool for Firewall auditing and it makes our external auditors very confident on the way our policies are managed.
Fireflow from Algosec also helps us identifying which firewalls are on the way from source to destination when we need to open flows and it saves us a lot of time. We are still on our path to implement full automation of firewall policy creation with Algosec's Fireflow but the goal is to achieve it soon.