Did you know you can pass data along-side voice on D-STAR? D-STAR has a "slow speed data" channel that runs in parallel with voice. D-RATS is a program that utilizes this data channel and lets you send chat messages, files, and memos/ICS forms/radiograms. Note that there is some minor tweaking of your radio's settings required to use D-RATS effectively.
Want to test out D-RATS? BCARES hosts a D-STAR Net on the 2nd and 4th Mondays around 8:30pm on KC0DS C.