Taskade - Make lists, organize your thoughts, and be inspired to get things done. Taskade is a collaborative space for your tasks.
Roadmap - Collision avoidance for projects and people
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Frill - A better way to collect customer feedback
Balloon - A drop box for your Dropbox
Usersnap - Usersnap is a customer feedback software for SaaS companies that need to constantly improve and grow their products.