Google Slides came in handy for picking out bridesmaids dresses, especially when we hit a wall deciding on styles and colors. I created a slideshow to lay out all our options, dropping in photos of different combinations of dresses we liked. Once we saw everything organized side by side, we were able to make a quick decision (and landed on a lovely lavender palette).
My husband and I wanted a really personal ceremony, so we collaborated on it with our officiant in Google Docs. Through comments and suggested edits, we helped him weave in stories and other little details about us. We also each wrote our own vows in Docs and shared them with a friend to drop in suggestions, questions and comments without worrying about version control.