Sorted is a minimalistic, yet awesomely powerful day planner for the productivity obsessed.
Sendtask is a free, simple and powerful task manager for teams and partners. It lets you track your work and collaborate with anyone in one place - even if they don't have an account.
Task Fighter is a productivity app that connects your Google Calendar to show your week events in a "Beat'em Up Game" style.
CollabPads lets users create, share, and collaborate on lists. Through the use of 'Pads', users control who can access a list and how they can make modications. Users can also create 'Quick Pads' without needing an account, which expire after a few days.