teoadal 

Simple implementations of DI, Mediator (or CQRS), Logger, JSON Serializer/Deserializer and Mapper

Velo implementation of the interfaces in Microsoft.Extensions.DependencyInjection. Velo is simple implementations of IoC-Container, Mediator (or CQRS), JSON Serializer/Deserializer and Mapper

Simple implementation of ECS (entity-component-system)

Improved mediator implementation in .NET

Simple collection on stack