[Edict] by [@zakarumych] is powerful Rust ECS crate that expands traditional ECS

feature set. The new version 0.2 is getting [ready for release]. This ECS is based

on archetypes for fast cache-friendly iteration. And there are quite a few novel

features:

- [Edict] allows to express relations between entities using [`Relation`] trait.

Relations are linked to a pair of entities - origin and target. This opens a

wide range of opportunities to create entity graphs with custom logic.

- Custom hooks for components and relations to trigger actions when component is

dropped/replaced, or when relation target is dropped.

- Optional [`Component`] trait. [Edict] allows using component types that do not

implement [`Component`] with some restrictions.

- Change tracking with flexible queries for modified components suitable for

complex use cases. E.g. incremental saves can fetch all components modified

since previous save.

- Type-agnostic component borrowing. Component type may define list of types

that can be borrowed from it. Important use case is borrowing [`dyn Traits`].

- [Edict] supports parallel execution. Built-in scheduler uses systems that

implement [`System`] trait. Functions can be safely transformed into systems

similarly to [`bevy_ecs`].

[Edict]: https://github.com/zakarumych/edict

[@zakarumych]: https://github.com/zakarumych

[ready for release]: https://docs.rs/edict/0.2.0-rc.3/edict/

[`Relation`]: https://docs.rs/edict/0.2.0-rc.3/edict/relation/trait.Relation.html

[`Component`]: https://docs.rs/edict/0.2.0-rc.3/edict/component/trait.Component.html

[`dyn Traits`]: https://doc.rust-lang.org/book/ch17-02-trait-objects.html

[`System`]: https://docs.rs/edict/0.2.0-rc.3/edict/system/trait.System.html

[`bevy_ecs`]: https://crates.io/crates/bevy_ecs