Gone - An ephemeral to-do list
Eventail - A compact calendar widget for iOS 🗓️
Streaks - The to-do list that helps you form good habits.
Riya Collective - Riya Collective makes it easy to buy or rent for your next Indian wedding.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.