How many times have you been giving a Webex or on-screen presentation, and your laptop screensaver kicks in or your computer goes to sleep? Rather than constantly fiddling with the trackpad to wake it up, give it some Caffeine!
Caffeine is a tiny program that puts an icon in the right side of your menu bar. Click it to prevent your Mac from automatically going to sleep, dimming the screen or starting screen savers. Click it again to go back. Right-click (or ⌘-click) the icon to show the menu.