Entitas VS Svelto.ECS

Github documentation for entitias looks like it is still good https://github.com/sschmid/Entitas-CSharp/wiki

For examples I usually turn to GitHub. It has numerous C# game engines. However, I find it easier to figure out implementations myself and use other engines only for API inspiration. There are also several C# ECS such as Entitas and DefaultECS that you can use if you do not want to create you own.

- Entitas

For existing libraries (which you can either choose to use, or choose to reference to look at how they implement ideas), maybe you can take a look at the following. I don't have experience with them, so I don't know how well they are implemented nor whether they strictly adhere to data-oriented design practices to get maximum performance, but it's not always strictly necessary to get the best performance out of everything unless you are writing a 3d AAA game with hundreds of thousands or even millions of entities: * Svelto.ECS - A C# ECS * FLECS - Written in C, but it also has a C# binding and it's a pretty well-regarded ECS implementation * ENTT - "Modern C++" ECS implementation * Bevy - a full game engine with a robust ECS implementation, written in Rust and quite modern.

He is also the author of the C# ECS framework: Svelto.ECS