FullScreenLab is a free browser-based collection of 81 fullscreen tools — no signup, no download, nothing to configure. Just open a tool and hit "Launch fullscreen." It spans 12 categories: focus timers (like Pomodoro), ambient lighting (ring light, softbox light), streamer overlays, podcast tools, screensavers, prank/fake-update screens, AI visualizations, and kids' learning screens.
