Zoiper - Cross-platform VoIP softphone dialer for SIP and IAX systems
HubSpot - Grow Better With HubSpot: Software that's powerful, not overpowering. Seamlessly connect your data, teams, and customers on one CRM platform that grows with your business.
MicroSIP - MicroSIP is a free portable SIP softphone for Windows based on PJSIP stack.
ActiveCampaign - Integrated email marketing, marketing automation, and small business CRM. Send beautiful newsletters, setup behavioral based automations, and benefit from sales automation.
Linphone - Linphone is an internet phone or Voice Over IP phone (VoIP).
Pardot - Salesforce B2B marketing automation