Are there any freeware plugins that would help me view the HTML Source generated by ASP.NET?
You can use Internet Explorer's View Source
button, under the 'Edit
menu. Firefox has something similar under the View
menu.
Edit: If you're looking for the source code for the application, you won't be able to see that no matter what you do. The server sends the client only what it wants the client to see. For ASP.NET, this means you'll see ASP.NET generated control IDs and the like. If you want to do this on your own without a web browser, try Wget.
You shouldn't have to look when that function is already built in to just about every single web browser out there. View Source is a standard feature.
The Internet Explorer Developer Toolbar has many features. The Web Developer add-on for Firefox looks slick. Here is a walk through of using another add-on for FireFox.
If what your looking for is just to view the source, all browsers I am familiar with have that feature built in. Internet Explorer
Microsoft's Fiddler2 for IE
Or Firebug for FireFox
With these you see the real source generated by ASP.NET, not the mangled source as shown in a browsers 'view source' menu option
Installing the Web Developer extension for Firefox will let you view 'generated' source (i.e. it includes changes made to the html by client side javascript etc..). Otherwise the standard 'view source' option available in any browser should suffice.