Asterisk is the world’s most popular open source telephony engine. AsteriskExchange™ is the online marketplace for products built on or integrated with Asterisk.
Open Source Distros
FreePBX is a web-based open source GUI (graphical user interface) that controls and manages Asterisk (PBX), an open source communication server. FreePBX is licensed under the GNU General Public License (GPL), an open source license. FreePBX can be installed manually or as part of the pre-configured FreePBX Distro that includes the system OS, Asterisk, FreePBX GUI and assorted dependencies.