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.
BoxCryptor - Boxcryptor encrypts your sensitive files before uploading them to cloud storage services like Dropbox, Google Drive, Microsoft OneDrive, Box, and many others.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Mega - Secure File Storage and collaboration
Slack - A messaging app for teams who see through the Earth!
Google Drive - Access and sync your files anywhere