Those who want to use their laptop as a media server or to play continuous music may want to keep operating it while the lid is closed. InsomniaX for Mac is a simple application that performs this single purpose well.
InsomniaX for Mac downloads quickly and comes with no restrictions. The program installs without any problems, too, although the user must accept a licensing agreement to complete the process. The user agreement contains several warnings and disclaimers about the potential problems the program may cause to the computer, which is troublesome. There were no user instructions or technical support available, but since the program has no real interface, this is not a problem. Once the installation completed, the program worked as intended and did not allow our computer to go to sleep, even with the test computer's lid shut. There were no additional features, but for those who want to be able to run processes with the screen off and the lid closed, the program may be of some use.
While functional, InsomniaX for Mac's limited features and system level changes mean it is likely of little use to average users; but more advanced users who understand the risks could find it useful.