All our open-source products do not require a license to operate, thus you can test and use them as you want. All commercial products, if used without a license, work in demo mode for some time (e.g. for 10 minutes, or for a specified amount of traffic). This is our standard way to quickly test a product.
If you need a longer time to test our tools, you can request us a longer testing license (e.g. 7-days testing license).