SigmaOS is a reinvented web browser, with no horizontal tab bar, no bookmarks, and only one browser window. It provides a faster browser, designed for work, allowing users to snooze pages and split the browser screen to help you focus on your work. Instead of windows, SigmaOS has “Workspaces,” appearing as a row of customizable icons along the left side of the screen, and each has its own vertical stack of tabs next to it. Every tab must belong to a Workspace, and the verticality is nonnegotiable. The company recently released SigmaOS1.0, after being in beta for more than a year, with features like collaboration and focus mode.