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.
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
ActiveCampaign - Integrated email marketing, marketing automation, and small business CRM. Send beautiful newsletters, setup behavioral based automations, and benefit from sales automation.
Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.
Pardot - Salesforce B2B marketing automation
Strikethru - Strikethru is a kind of to-do list notebook for managing work lists and staying updated with the important tasks.