Cluster is a Chrome extension that helps you manage multiple open tabs and windows with ease. It offers a variety of features to help you keep your browser organized and free up memory. With Cluster, you can quickly navigate to open windows and tabs, sort windows and tabs for better overview, and suspend all windows and tabs to minimize load times.

One of the best features of Cluster is the tab project manager, which allows you to easily save and restore windows and tabs sessions as working projects. Restored windows launch each tab in a suspended state, which is great for minimizing load times when opening lots of tabs at once. The extension also includes the option to undo removed tabs or windows, search and filter tabs by title or URL, and easily move tabs between windows.

Cluster is built to be fast, simple, and uses minimal system resources to not get in its own way. It also offers a dark theme and tab audio indicator. The extension is free to use, but if you want to sync your saved windows across multiple machines, you'll need to purchase a one-time fee license that helps support Cluster development and cost associated with third-party services.

Overall, Cluster is a great tool for taking control of your browser sessions, keeping things organized, and freeing up memory. If you're looking for a window and tab manager for Chrome, this is definitely one to consider.