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Repetier and repetier.com are projects concerned with 3D printer software. 'Repetier' is usually use synonymous for repetier-firmware, which is a 3D printer firmware. Use the 'repetier-host' tag if your question is about the host software.

Repetier-host and repetier-firmware are projects concerned with 3D printer software.

repetier-host is used to send g-code to 3D printers.

repetier-firmware is firmware for the Arduino based control boards of RepRap based 3D Printers.

Repetier is usually synonymous for repetier-firmware.