OSgrid

VS

Scum

OSgrid is a long-running open-source virtual world based on OpenSimulator, resembling a decentralized alternative to Second Life. Its userbase is niche and dedicated, but much smaller than mainstream MMOs, likely in the low hundreds of daily users. Activity is mostly from community events and creators rather than a mass-market gaming audience.

Scum is a multiplayer open-world survival game developed by Gamepires and originally entered Early Access in 2018. While it is not a full MMO, it supports servers with dozens of players (up to 64 per server). The game maintains a niche but dedicated following and is frequently updated; however, it has never reached large mainstream status. Based on long-term trends of similar survival games, its daily active player base is estimated to be in the low thousands, and this estimate would hold unless a major relaunch or expansion revitalized the player base.