MadAhead - Co-write stories, poems, etc. Debate, discuss or create fun conversations.
Listy Beta - The things you love, privately saved and beautifully listed
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
CoffeeRun - Let everyone enter their order for coffee runs
Taskful - Deadlines, meet your match.
TaskPaper - Plain text to-do lists for Mac