Revery Online has been a pet project of mine for almost as long as I have been working with Unity. It has seen several versions over the years, starting off as a standard single-player RPG and eventually evolving into a full-fledged MMO. Using SmartFox Server 2X, Revery uses an Area of Interest setup to keep the data being transferred to and from clients to a minimum. Items of interest and NPCs are spawned just outside of the camera view as the player traverses the realm and are removed as the player moves away. The same goes for other players, and all of this information is tracked on the server-side and then fed to the client via either UDP or TCP.
The most recent addition to Revery has been player housing, which allows each player to rent a house and begin furnishing it with containers that can store items they find during their quests. While the game is mostly prepped for an alpha-release, I unfortunately ran into the problem of not being able to find enough art assets to continue its progress. Hiring artists to create all of the enemies and items this game would require would be a major investment, so for now Revery exists solely as a place for myself and Zoey to run around and remember the days of when she first grabbed hold of the mouse at my desk and began her first RPG adventure.