wikiHow
The Answer Bank
Ask Me Help Desk
Blurtit
Fluther
WikiSpooks
SaidIt.net
Ask.fm
Taskbit
Todoist
Things
Trello
Taskee.pro
monday.com
TickTick
Huminos
The Answer Bank - The Answer Bank is the UK’s leading question-and-answer site.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Ask Me Help Desk - Ask Me Help Desk is a question-and-answer site.
Things - Things is an easy to use task manager.
Blurtit - Blurtit is a Q&A website. You can ask a question or answer on any question.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.