Zoiper

Zoiper is a free softphone app that supports auto-dialer functionalities via SIP or IAX protocols. Users can load contact lists or CSV files, letting the software systematically call each number. A pop-up notifies agents when the call connects, letting them see contact notes. Because Zoiper works with many VoIP providers, it’s popular among small teams wanting flexible auto-dial capabilities. Though it’s not a full call center suite, the free version supports essential dialer features if configured with a VoIP PBX or partner, making it ideal for lean setups.