HubSpot CRM - Free CRM software for small businesses.
DeskAlerts - Send alerts to any corporate device: PCs, phones, tablets, etc.
Keap - Grow Sales. Save Time. Get Organized.
Notifuse - A 1-to-many notification API that's simple to use
Less Annoying CRM - A simple customer relationship manager made just for small businesses. Manage contact info, track leads, and never miss a follow-up.
Text Alerts - Mobile Text Alerts allows administrators to send out mass SMS text messages to groups, it is useful way to keep group members informed about quick announcements.