EnTT: Similar projects

EnTT 3.15.0

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# Table of Contents

- Introduction
- Similar projects

# Introduction

There are many projects similar to `EnTT`, both open source and not.
Some even borrowed some ideas from this library and expressed them in different languages.
Others developed different architectures from scratch and therefore offer alternative solutions with their pros and cons.

If you know of other similar projects out there, feel free to open an issue or a PR, and I will be glad to add them to this page.
I hope the following lists can grow much more in the future.

# Similar projects

Below an incomplete list of similar projects that I have come across so far.
If some terms or designs are not clear, I recommend referring to the ECS Back and Forth series for all the details.

- C:
  - destral_ecs: a single-file ECS based on sparse sets.
  - Diana: an ECS that uses sparse sets to keep track of entities in systems.
  - Flecs: a multithreaded archetype ECS based on semi-contiguous arrays rather than chunks.
  - lent: the Donald Trump of the ECS libraries.
- C++:
  - decs: a chunk-based archetype ECS.
  - ecst: a multithreaded compile-time ECS that uses sparse sets to keep track of entities in systems.
  - EntityX: a bitset based ECS that uses a single large matrix of components indexed with entities.
  - Gaia-ECS: a chunk-based archetype ECS.
  - Polypropylene: a hybrid solution between an ECS and dynamic mixins.
- C#
  - Arch: a simple, fast and unity entities inspired archetype ECS with optional multithreading.
  - Entitas: the ECS framework for C# and Unity, where reactive systems were invented.
  - Fennecs: the little archetype ECS that loves you back.
  - Friflo ECS: an archetype ECS with focus on performance and minimal GC allocations.
  - LeoECS: simple lightweight C# Entity Component System framework.
  - Massive ECS: sparse set based ECS featuring rollbacks.
  - Svelto.ECS: a very interesting platform-agnostic and table-based ECS framework.
- Go:
  - gecs: a sparse sets based ECS inspired by `EnTT`.
- Javascript:
  - @javelin/ecs: an archetype ECS in TypeScript.
  - ecsy: I have not had the time to investigate the underlying design of `ecsy` but it looks cool anyway.
- Perl:
  - Game::Entities: a simple entity registry for ECS designs inspired by `EnTT`.
- Raku:
  - Game::Entities: a simple entity registry for ECS designs inspired by `EnTT`.
- Rust:
  - Shipyard: it borrows some ideas from `EnTT` and offers a sparse sets based ECS with grouping functionalities.
  - Sparsey: sparse set based ECS written in Rust.
  - Specs: a parallel ECS based mainly on hierarchical bitsets that allows different types of storage as needed.
- Zig
  - zig-ecs: a zig-ification of `EnTT`.