.NET桌面应用程序的最佳崩溃报告框架？

I've got a couple simple Windows Forms apps that I'd like to add crash reporting to. Something that will give me info on what crashes are happening on user's machines (wrt my app, of course), including stack traces, logs, and screenshots, and a UI component for asking the user whether they want to upload it, etc. My apps are free, so I'd prefer a free component, and something that included an online aggregator (like I've got a couple simple Windows Forms apps tha