Polly.Net40Async is a version of the Polly library for .NET 4.0 with async support via Microsoft.Bcl.Async. Polly allows developers to express resilience policies such as Retry, Circuit Breaker, Timeout, Bulkhead Isolation, and Fallback in a fluent and thread-safe manner.
Throttlebird is a simple Http request throttler to help limit the number of client requests within a given period of time.