Memory Monitor is a free Chrome extension developed by Daniel Herr. It falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. As the name suggests, Memory Monitor provides users with a convenient way to keep track of their RAM usage.

The main feature of Memory Monitor is its ability to display available memory at a glance through its icon in GB. This allows users to quickly see how much RAM they have available without the need to open any additional windows or applications. For more detailed information, users can simply rollover the icon.

In addition to the icon display, Memory Monitor also offers several other useful features. Users can click the icon to display an infobar on websites, open a separate panel that stays in view (requires a separate app), and display an icon on the Chrome OS shelf (requires enabling the chrome://flags/#enable-panels option). Furthermore, customization options are available by right-clicking the icon and selecting "options".

Overall, Memory Monitor is a handy Chrome extension for users who want to easily monitor their RAM usage without any hassle. Its simple and intuitive interface makes it accessible to users of all levels of technical expertise.