There will always be things we want to do, but we just cant get the budget for them. One option is to employ free or open source tools in limited deployment. This choice can help demonstrate value and work as a proof point for future budget conversations. Active defense is particularly useful in a cybersecurity context because of the time-constrained nature of an attackers campaign. The goal is to make the adversaries campaigns harder by denying them key resources. Here are some of the most effective active defense strategies and tools you can test.”]
Source: https://securityintelligence.com/open-source-tools-for-active-defense-security/