ether/etherpad is a real-time collaborative document editor where several people write the same document together and review its history. The latest release on GitHub record is v3.3.9, the primary language is TypeScript, and the license is Apache-2.0.
The repository description calls this editor a 'really-real-time' collaborative document editor, meaning edits are reflected together while typing rather than after saving. What this repository is made of is a tool that bundles author attribution together with collaborative writing and change history. The README states that it shows the author on every keystroke and preserves revision history. The timeslider is a feature for looking at how a document changed over time. It can be run directly on your own server. AI is installed as a plugin by choosing the model and infrastructure you want, and the user decides which model to attach where. The repository started on March 26, 2011 and has 18,593 stars.
That said, the collected record contains no list of changes for v3.3.9. What this release fixed has to be checked directly in the repository's release notes. There are also no figures showing the performance or the size of the improvement in this version. Of the evaluation values, only the momentum item is present, at 0.0, and the remaining items have no given value. What this repository does can be known, but the extent of this version's improvements cannot be known before looking at the source.