Klaviyo - Klaviyo helps brands own the customer experience, grow higher-value relationships, and deliver more personalized marketing experiences across email, mobile, and web.

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

Criteo - Build, scale, and activate first-party audiences with The Commerce Media Platform.

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

Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.

Strikethru - Strikethru is a kind of to-do list notebook for managing work lists and staying updated with the important tasks.