FreePBX

FreePBX is an open-source PBX platform built on Asterisk. While primarily a PBX, it supports auto-dialer capabilities via community modules or custom dialplan scripts. Users can set up call campaigns that sequentially dial numbers from a list. Agents can pick up calls via a softphone or SIP device. FreePBX’s web GUI simplifies telephony configuration. Though advanced call center features may require additional modules, the base system is free to download and self-host, making it a popular choice for hobby projects or budget-conscious businesses wanting a dialer without license costs.