Top 20 NuGet WeakEvent Packages

INotifyPropertyChanged, Recordable (undo/redo) and Weak Event patterns. An official PostSharp pattern library.
A generic weak event implementation.
DEPRECATED - see A core library that provides helpful functionality including base classes for disposables and finalizers, weak events, proxies, support for retry policies, XML conversion/serialisation and embedded resources.
Offers a way of creating weakbindings to avoid Memory Leaks when using events.
Collection of useful classes for your .NET application: Object Pool, Thread Pool, Queue Async Processor, BlockingQueue, DiskQueue, ThreadSetManager, Throttling, Semaphore, EntryCounteringEvent, Collections, ReadOnlyCollections, IoC, WeakEvent and other.
WeakSubscribe to events. Taken from the MvvmCross codebase and provided on its own. WeakSubscribe hands responsibility to the client code, unlike using a WeakEventManager which requires modified events. See project site for instructions.
Laziness Lib with extensions for lazy developers