MoonEdit is described as 'Multi-platform collaborative text editor: Cooperative multi-user text editing over the internet' and is an app in the Development category. There are four alternatives to MoonEdit for a variety of platforms, including Linux, Mac, Online / Web-based, Windows and Android. The best alternative is Zoho Writer. It's not free, so if you're looking for a free alternative, you could try SubEthaEdit or Gobby.
An online word processor that lets you create and edit documents in your web browser and save them in the cloud, so that you can share them with anyone. Zoho can allow multiple users to work on a document simultaneously.
The app that started the collaborative editing revolution is back. Write articles, code, notes or meeting minutes with friends – wherever they are. Ideal for extreme programming sessions, tutoring and creative writing. And now it is free and open source!