Novocall - Novocall converts web visitors into sales calls in seconds.
Zoiper - Cross-platform VoIP softphone dialer for SIP and IAX systems
Facebook Auto Reply - Create Facebook autoresponder campaigns for your pages and groups.
MicroSIP - MicroSIP is a free portable SIP softphone for Windows based on PJSIP stack.
Chatfuel - Chatfuel is the best bot platform for creating an AI chatbot on Facebook.
Sipnetic - Sipnetic is a free VoIP softphone based on the SIP protocol.