Boolean - Send single question yes/no surveys
Taskade - Make lists, organize your thoughts, and be inspired to get things done. Taskade is a collaborative space for your tasks.
Surveys in Slack by Polly - The world's first fully immersive Slack-based survey product
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Simple Poll - The easiest way to create polls in Slack
Balloon - A drop box for your Dropbox