There are many tools available for free that can be used to flood a server and perform an attack. A few tools also support a zombie network to perform DDOS attacks. We have compiled a few freely available DOS attacking tools. The most popular DDoS attack tools in 2019 are HULK, Slowloris, and Tors Hammer Hammer. The tools are for testing purposes and are for slow post attack and are created for test purposes. DDoS attacks can do temporary or permanent damage to a website and slow down network performance.”]
Source: https://hackercombat.com/dos-attacks-and-free-dos-attacking-tools/