Asterisk is the world’s most popular open source telephony engine. AsteriskExchange™ is the online marketplace for products built on or integrated with Asterisk.
Billing & Call Accounting
Freeside Open Source Billing Platform
Freeside is the premier open-source billing, CRM, trouble ticketing, network monitoring and provisioning automation software for ISPs and WISPs, VoIP providers, CLECs, colocation and hosting providers and other online businesses.