Guidescope Inc. was founded in 2000 in order to 'help individuals navigate the Web faster, safer, and easier,' according to Their tool, also called Guidescope, acts as a local http proxy, blocking banner ads and cookies. Binaries are available for the Microsoft OS', Linux (x86) and Solaris (SPARC, x86).

The folk behind the internet junkbuster helped create Guidescope, but these two tools are fundamentally different. The internet junkbuster uses regular expressions in urls to filter banner ads. Guidescope does this as well, but also queries a remote database of banner advertisements, submitted by fellow users.

The internet junkbuster folk recommend that people new to advertisement filtering try Guidescope first.

Unlike the internet junkbuster, Guidescope is not GPLed. We're told that the source code will be made available, though.