Teun 

SimpleBrowser is a lightweight, yet highly capable browser automation engine designed for automation and testing scenarios.

Allows you to automate SimpleBrowser, the C# headless browser from code using Selenium webDriver. SimpleBrowser is a lightweight, yet highly capable browser automation engine designed for automation and testing... More information

BatchFlow is a .NET library that takes care of all the plumbing you need around large batch processing, especially the producer/consumer pattern that you (probably) should use.