These are the most common types found in open directories. They operate at the operating system level to intercept the signals sent from the keyboard to the programs you are typing in. These intercept keyboard APIs to record strokes.
However, searching for and downloading software from open directories carries immense security risks. This article explores what an "index of keylogger" search signifies, how keyloggers work, the legal implications of using them, and how to protect yourself from directory-based malware. What Does "Index of Keylogger" Mean? index of keylogger
Are you researching this for or system administration ? These are the most common types found in open directories