Browsers:

Browsers used by visitors of your site.

Firefox Versions:

Versions of the Firefox browser.

Chrome Versions:

Versions of the Google Chrome browser.

Opera Versions:

Versions of the Opera browser.

Browsers / Countries:

Popularity of browsers by countries.

Operating Systems:

Operating systems used by visitors of your site.

Browsers and OS:

Popularity of browsers by operating systems.

.NET Framework:

Versions of the .NET Framework used by visitors of your site.

Flash:

Flash versions. This report requires installing a special tracking code on the pages of your site.

Spiders:

List of spiders requested files from the site.

Spidered Pages:

Lists of pages requested by different spiders.

Spider Hosts:

Lists of IP addresses/domain names of hosts used by different spiders. You can enable the Lookup DNS Names option in Profile Properties > General to convert IP addresses to domain names if your log files contain unresolved domain names.

Some IP addresses don't have corresponding domain names so there may be IP addresses shown in the table even with the Lookup DNS Names option enabled.

Spider Organizations:

Organizations of different spiders. The report requires an additional geolocation database that can be downloaded from the program's website.