Link: https://play.google.com/store/apps/details?id=com.axehigh.android.todonowplus
A Simple todo applications which is designed around a simple text file as the source. You can connect to Dropbox and use a textfile here as the source.
Using the todonow-app you can send the task to the calender making a reminder, browse if its a url, send it to any text apps f.ex mail or txt-message.
Example file below :
TODO
****
Deliver box to Eric
Remove stains from sofa
SHOPPING
********
Milk
Butter
Bread
Copy the text between the tag to your dropbox root directory and name the file todo.txt and select "load from dropbox".
All todo-items are a one-liner in a textfile. A list is defined by an underlining minimum four stars "****".
Take a note of that the user must themself keep track of if the last version is edited by either the texteditor or on the phone.