In the Python project described, the following libraries are used:
1. `datetime` library: Used to handle date and time functions for scheduling messages at specific times.
2. `schedule` library: Used for scheduling messages at specified times.
3. `twilio.rest` library: Used to interact with Twilio's WhatsApp API for sending messages.
These libraries enable the creation of a script that schedules and sends WhatsApp reminder messages at specific times based on the user's requirements.
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