Mar 7th 2008 1:10AM Grid, BunchofBars, Pitbull, PerfectRaid and VisualHeal all use the Healcom library to share healing information. Using any of these addons along with whichever method you use to cast heals will share that information with other people using a mod that incorporates Healcom, or indeed anyone who's just got the Healcom library loaded.
To the best of my knowledge a similar stand alone library is not available for Healbot. I run with Healbot loaded but hidden so that Healbot users can see my heals, I use Grid and Clique primarily. That covers all the bases.