Attack server

Hello, does anyone know some stresser that really works?
I created a server and configured it and I will carry out a test attack to verify my firewall work.
If possible the cheapest because I do not want to throw a lot of money away.

Mac or PC?

First congratulations by bolsonaro pic, you have one good taste.

Second you tried cloudflare? this is the best option for ddos of market and the cloudflare have free plans.

Third try find in deepweb or russians forums he have good list of stressers websites but the major part is paid