Greasemonkey is a Mozilla Firefox extension that allows users to install scripts that make on-the-fly changes to web page content. Developed by Anthony Lieuallen, Aaron Boodman, Johan Sundström
License: Open Source
Greasemonkey is primarily focused on allowing users to customize web pages with user scripts, making it ideal for users who want granular control over web content. In contrast, Ubiquity offers a unique command-based interface that enables users to perform tasks and automate actions using voice commands and scripts, making it suitable for more general task automation.