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Showing content from https://github.com/sschmid/Entitas-CSharp below:

sschmid/Entitas: Entitas is a super fast Entity Component System (ECS) Framework specifically made for C# and Unity

Entitas is free, but powered by your donations

Entitas - The Entity Component System Framework for C# and Unity

Entitas is the most popular open-source Entity Component System Framework (ECS) and is specifically made for C# and Unity. Several design decisions have been made to work optimal in a garbage collected environment and to go easy on the garbage collector. Entitas comes with an optional code generator which radically reduces the amount of code you have to write and makes your code read like well written prose.

#1 open-source ECS on GitHub
100% open-source under the MIT License
great and helpful community on Discord
easy to learn and easy to use
works great in pure C# standalone projects without Unity
comes with great Unity integration called Visual Debugging
battle-tested at companies like Popcore (Rollic / Zynga / Take Two), Gram Games, Wooga, Plarium, Storm Chaser and many more

Video Tutorials and Unity Unite Talks

The optional code generator lets you write code that is super fast, safe and literally screams its intent.

var entity = context.CreateEntity();
entity.AddPosition(Vector3.zero);
entity.AddVelocity(Vector3.forward);
entity.AddAsset("Player");

using static GameMatcher;

public sealed class MoveSystem : IExecuteSystem
{
    readonly IGroup<GameEntity> _group;

    public MoveSystem(GameContext context)
    {
        _group = context.GetGroup(AllOf(Position, Velocity));
    }

    public void Execute()
    {
        foreach (var e in _group.GetEntities())
            e.ReplacePosition(e.position.value + e.velocity.value);
    }
}

Entitas is fast, light and gets rid of unnecessary complexity. There are less than a handful classes you have to know to rocket start your game or application:

Context
Entity
Component
Group

Entitas ECS

+-----------------+
|     Context     |
|-----------------|
|    e       e    |      +-----------+
|       e      e--|----> |  Entity   |
|  e        e     |      |-----------|
|     e  e     e  |      | Component |
| e          e    |      |           |      +-----------+
|    e     e      |      | Component-|----> | Component |
|  e    e    e    |      |           |      |-----------|
|    e    e     e |      | Component |      |   Data    |
+-----------------+      +-----------+      +-----------+
  |
  |
  |     +-------------+  Groups:
  |     |      e      |  Subsets of entities in the context
  |     |   e     e   |  for blazing fast querying
  +---> |        +------------+
        |     e  |    |       |
        |  e     | e  |  e    |
        +--------|----+    e  |
                 |     e      |
                 |  e     e   |
                 +------------+