Sports Clubs and Gyms use it remind players of training schedules, remind fans of supporter events, remind fans of match schedules etc.
Medical appointment reminders.
Distribution companies use it to schedule bank holiday schedules in advance- for example you can preplan all messages for bank holidays with reminders to suppliers that they need to have their feed stocks sent in by a Friday, for example.
Refuse and recycling companies use it to remind their customers of collection schedules.
Marketing companies use it for planning various messages in a campaign.
Concert promotion companies use it as an event reminder.
Promotional companies use it on behalf of their clients to increase brand effectiveness & customer interactiveness. Particularly useful for florists or other business centring on occasions and festivals.
Recruitment companies use it to remind interviewees of job interviews automatically.
Businesses use it to remind employees of upcoming meetings.
Colleges/Schools use it to remind students/parents/staff of exam date reminders, meeting reminders, extra tutorials.