Google Docs

Google Docs' quiet revolution was removing the save button: autosave plus visible version history reframed a document as a living stream rather than a file you protect. Collaboration is presence-first — colored cursors and live typing make co-authoring feel safe because you can always see who's where. Comments anchor to a text range and resolve into a side thread, keeping discussion adjacent to the prose without cluttering it. The toolbar deliberately echoes decades of word-processor convention, lowering the learning curve at the cost of looking dated. Suggestion mode overlays edits as proposals instead of changes, encoding a whole review workflow into a single toggle. It's a familiar surface concealing a fundamentally networked document model.