# Similar projects

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

Below an incomplete list of those that I've come across so far.<br/>
If some terms or designs aren't clear, I recommend referring to the
[_ECS Back and Forth_](https://skypjack.github.io/tags/#ecs) series for all the
details.

I hope this list can grow much more in the future:

* C:
  * [Diana](https://github.com/discoloda/Diana): an ECS that uses sparse sets to
    keep track of entities in systems.
  * [Flecs](https://github.com/SanderMertens/flecs): a multithreaded archetype
    ECS based on semi-contiguous arrays rather than chunks.
  * [lent](https://github.com/nem0/lent): the Donald Trump of the ECS libraries.

* C++:
  * [decs](https://github.com/vblanco20-1/decs): a chunk based archetype ECS.
  * [ecst](https://github.com/SuperV1234/ecst): a multithreaded compile-time
    ECS that uses sparse sets to keep track of entities in systems.
  * [EntityX](https://github.com/alecthomas/entityx): a bitset based ECS that
    uses a single large matrix of components indexed with entities.

* Javascript:
  * [ecsy](https://github.com/MozillaReality/ecsy): I haven't had the time to
    investigate the underlying design of `ecsy` but it looks cool anyway.

* Rust:
  * [Legion](https://github.com/TomGillen/legion): a chunk based archetype ECS.
  * [Shipyard](https://github.com/leudz/shipyard): it borrows some ideas from
    `EnTT` and offers a sparse-sets based ECS with grouping functionalities.
  * [Specs](https://github.com/amethyst/specs): a parallel ECS based mainly on
    hierarchical bitsets that allows different types of storage as needed.

If you know of other resources out there that can be of interest for the reader,
feel free to open an issue or a PR and I'll be glad to add them to this page.