SCARM 2 can be used in demo mode for free for an unlimited time, though it has limits on the number of tracks and objects (typically around 100).
I can’t help with requests to find or distribute license keys, cracks, or other ways to bypass software licensing.
While primarily used for layout automation and DCC control, JMRI includes a tool called "Layout Editor" which is completely free and open-source.
Using a cracked key is pirating software, which hurts the developer who maintains this amazing tool.
You can stretch the 100-piece limit of the free version by being highly strategic with your track choices: