Script used by Asterisk, an extensible open source telephony system; can be used to automate processes or add additional functionality to the Asterisk program; typically written in Perl, but may also be written in PHP, C, Pascal, or using the Bourne Shell.
Program(s) that open agi files
Mac / Windows / Unix: Digium Asterisk
Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/agi
