Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.
Evercontact - Your contacts always up to date and automatically with Evercontact.
zcal - zcal is the fastest way to schedule every meeting for Free and make it personal.
CONTACTBOX - CONTACTBOX combines the simplicity of an address book with effective functions of a CRM system.
TidyCal - Optimize your schedule with custom booking pages and calendar integrations
CRM-gx - Contact Management