Linux

Similar goal, different function.

There aren't install scripts like lutris, which makes it harder, once in a while, to install certain games that might need a modification.

What makes it special is that it puts each program in a "container" (hence the name) that is sandboxed from your system. E.g. if you were trying to run a program infected with malware, it would have a very hard time trying to infect the rest of your system, where with lutris and Heroic, that separation doesn't exist so it would have full access.

It is less targeted at games and more at general programs.

That is about it. The interface is much worse than lutris or heroic, but it is still a useful program.

Nah, it's actually tailored more towards non-gaming stuff, but it does games too.