1)   IEWatch 4.5
IEWatch is a plug-in for Microsoft Internet Explorer that allows you to analyze HTTP/HTTPS headers, Cookies, GET queries and POST data. The innovative 'HTML Spotlight' feature allows quick pinpointing of the HTML code.
HTTP viewer, HTTPS viewer, http proxy, https proxy, HTTP Software, http tool, HTML Analyzer, HTTP headers, HTTP Cookies, HTTP POST,

 2)   URL Thing 1.0
URL Thing is a free utility that lets you see the raw results of an HTTP query to any URL. It allows the user to view the full HTTP headers, the time it took for the server to respond and the size of response in bytes.
url query, http query, get url, http headers,

 3)   ETagFix 1.00
ETagFix is an ISAPI plugin which integrates directly into IIS and other web servers to alter the etag that IIS produces so that web crawlers will not check your web site so often.
isapi, iis, server, etag, http headers, page, expired, cache, reboot, restart,

 4)   WebSlower 2.0.2
WebSlower allows you to test local (or remote) website simulating different speed connections. It's very useful to test Flash preloads and audio/video streaming and performances. It allows also analyzing request and response headers and executing custom HTTP requests.
webslower, analyze, http headers, test, download speed,