Give to parents all information about the school activities of their children. SMS/SMSC/e-mail 2-way server will give you all-around help in providing such a service. SchoolSMS server will take care of receiving/sending, while client application will let you change main database information. Also, it is possible to use school existing MDB database as a main SchoolSMS database.
Free to try
Microsoft .NET Framework 1.1, Nokia mobile phone with PC connection