InsomniaT Alternatives
InsomniaT is described as 'This is a kernel extension and clients that allow the MacBook to disable sleeping when the lid is closed. MOUNTAIN LION IS NOT SUPPORTED' and is a prevent sleep mode app in the os & utilities category. There are more than 10 alternatives to InsomniaT for Mac, Windows, Android and F-Droid. The best alternative is Amphetamine, which is free. Other great apps like InsomniaT are Caffeine for Mac, Don't Sleep, Coffee Buzz and Should I Sleep.
Welcome to Amphetamine4, the most awesome keep-awake utility ever created for macOS. Amphetamine can keep your Mac, and optionally its display, awake through a super simple on/off switch, or automatically through easy-to-configure Triggers.
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. Hold down the Command key while clicking to show the menu.
Discontinued
This software has not been updated in 9 YEARS!(Reassigned from dangerous by IanDorfman on 2019-04-18)
Don't Sleep is a small portable program to prevent system shutdown, Standby, Hibernate, Turn Off and Restart.
Coffee Buzz is the easiest and safest display-sleep preventer available, with simple operation and exclusive Safety Auto-Shutoff feature. Keeping your Mac awake (and letting it sleep again) is as simple as a click!.
Annoyed by the display getting dim when you're reading or watching something? What if the computer could “see and hear” you?
Coffee allows you to keep the display awake without having to change the device settings. It can be toggled at various places:
Keeps your Mac awake.
It always has been a missing feature: disabling the sleep mode on a Apple Laptop. Who does not want to use it as a big juke-box or go warwalking. The best looking server ever, especially at about one inch height.
Discontinued
The software is discontinued from July 2017 http://semaja2.net/2017/06/thank-you-and-farewell-for-now/
Prevent your Mac from falling asleep, dimming your screen or starting the screensaver. Theine keeps macOS awake just like caffeine does with you.
NoDoze simulates keyboard/mouse activity to keep the screensaver from activating. Its activity depends on currently running programs. You can use regular expressions or Windows wildcards to choose when the screensaver is deactivated.