Ii you have made it here I highly recommend you read the cc65 main web page – www.cc56.org

This is the site for the cc65 tool suite that comprises of the following tools

cl65 – invokes the complier, assembler then linker to produce output
cc65 -Complier

ca65 – Assembler

ld65 – Linker

ar65 – Archiver (libraray)

and supports the following platforms

Commodore C64, C128, C16, C116 P500, 600, 700 and Plus/4

Apple II (II+ and IIe, IIgs)

Atari 8 bit

Oric Atmos

Nintendo Entertainment system

Supervison Game Console

Atrai Lynx Console