Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
BoxCryptor - Boxcryptor encrypts your sensitive files before uploading them to cloud storage services like Dropbox, Google Drive, Microsoft OneDrive, Box, and many others.
Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.
Cloudfogger - Easy and secure encryption for the cloud. Provides security for all cloud storage services like Dropbox, OneDrive and Google Drive.
Strikethru - Strikethru is a kind of to-do list notebook for managing work lists and staying updated with the important tasks.
Mega - Secure File Storage and collaboration