List of all known Browser Helper Objects

"What is a Browser Helper Object?"

The list of BHOs is no longer hosted here. The current list is located at CastleCops.

A Browser Helper Object, or BHO, is just a small program that runs automatically every time you start your Internet browser. Usually, a BHO is installed on your system by another software program. For example, Go!Zilla, the downloading utility, installs a BHO created by Radiate (formerly Aureate Media); this BHO tracks which advertisements you see as you surf the Web.

The natural question is, what do BHOs do? The technical answer is "anything", but generally, it will have something to do with "helping" you browse the Internet.
Of course, many BHOs are what is called "ad-ware" or "spyware": they do things like monitor the websites you visit and report this data back to their creators."

They can also routinely conflict with other running programs, cause a variety of page faults, run time errors, and the like, and generally impede browsing performance.

A great little tool for viewing and, if required, disabling, the BHOs that may be installed on your machine is BHODemon, which can be downloaded here