Postscript - Like Mailchimp for SMS
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
Tatango - Tatango is a mobile messaging platform for agencies.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Flowroute - Flowroute provides direct access to telephony resources - such as calling, messaging (SMS & MMS), call routing, SIP Trunking and Communication APIs.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.