Bookmark Manager
Note Taking (mainly for computer science folks)
Instant Messaging
Social Group/Team Chat + Collaboration
Password Manager
VPN
Finance Tracking
Web News Consolidator
Music Streaming
Cloud Storage
Reminders and To-Do lists
Project Management and Collaboration
Email + Calendar (Not Paid Office Suits)
Email Aggregator Application
Private Email Address System
Money Transfers
Browser
Social Platform
Authenticator App
Password Managers have also incorporated the 2FA functionality, so this may be redundant based on the password manager in use.