Gobby is a multi user text editor for Windows and Linux. It works with a server/client principe. (One user opens a server, other users join as clients. There is a dedicated version too.) Gobby allows you to edit a document with more users at once. This can be used for many things like writings essays, group-work for school and studies or coding work. The last part is the best one in my opinion. It’s great to code a bit with your friends and develop programs together.