The 2.5 version of Lungo for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This Mac application was originally created by Sindre Sorhus. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. Lungo for Mac lies within System Tools, more precisely System Optimization.
From the developer:
Has your computer ever gone into sleep mode unexpectedly and inconveniently? Lungo is a simple utility app that prevents your Mac from sleeping or dimming when you don’t want it to. Whether it’s a presentation, a video, or a recipe you need to keep open, Lungo keeps your Mac awake until you’ve finished what you’re working on.
You may want to check out more software for Mac, such as Mac Pilot, Dock-It or AppTrap, which might be similar to Lungo.