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Flask, obviously.
Flask-Login for the user accounts.
Flask-SQLAlchemy interacting with the database.
Flask-WTF and WTForms for the form handling.
Flask-Mail for sending mails. itsdangerous for generating random tokens for the confirmation emails.
Flask-Bcrypt for generating secret user passwords.
Flask-Admin for building an administration interface.
Flask-Script for managing the app.
structlog for logging.
Flask-DebugToolBar for adding a performance toolbar in development.
gunicorn for acting as a reverse-proxy for Nginx.