Eltima Serial Port AX Control is a powerful ActiveX component that can be used to simplify communication with external devices on rs232 connection. This includes modems, bar code readers, PBX or any other devices that have a serial interface.
DAC for MySQL (also known as MySQLDAC) is the most powerful component suite for Delphi/C++Builder/ MySQL. It allows you to create Delphi/BCB applications with direct access to MySQL DB without BDE/ODBC. A MySQL library is not required.