Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.

Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.

Twilio Studio - Accelerate your customer engagement roadmap

Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.

Froged - One click solution providing easy-to-use marketing, sales and support services to turn website visitors into happy customers.

CherryTree - A hierarchical note taking application, featuring rich text and syntax highlighting, storing data in a single xml or sqlite file.