ARIM means "Amateur Radio Instant Messaging". It's a protocol for sending and receiving text messages and files over the ARDOP TNC being developed by Rick KN6KB and John G8BPQ. arim is a host mode program for ARIM which runs on Windows and Linux operating systems. Full information and download links are found on the ARIM home page.

gARIM is the GUI version of ARIM. It works the same way but has additional ease-of-use features. garim is a host mode program for ARIM which runs on Windows and Linux operating systems. Full information and download links are found on the gARIM home page.