Onesheet CRM - The Simple CRM for Google Sheets
Crmble - Easy peasy crm for Trello
InStream CRM - Business relationship management platform - CRM alternative
HubSpot CRM - Free CRM software for small businesses.
SquareOne - Email. Stress-free.
Followup.cc - FollowUp for email is a lightweight productivity suite that keeps your conversations and tasks from slipping through the cracks. Set perfectly timed reminders that arrive at the top of your inbox, right when you need them.