GTasks.net is a simple todo list app which can synchronize with google tasks, you can manage your tasks with it, and never lose your data.
Main Features:
1.  Support auto or manual synchronization with Google Tasks; Or the local mode that does not require synchronization.
2. Support alert for tasks base on local notification.
3.  Support multiple task lists, user can define the colors to mark different task lists; Viewing all the tasks with convenient “All Tasks” list.
4.  Support multiple task sort methods by time, letters, and user-defined order.
5.  Support sub-tasks; tasks share via Email.
6.  Synchronization is over https to protect your data.