What are some alternatives?
When comparing Campfire and Voxelands, you can also consider the following products
Slack - A messaging app for teams who see through the Earth!
Terasology - Terasology (started under the name Blockmania) is an open source project started by Benjamin...
Glip - Glip is fully searchable, real-time group chat & video chat, task management, file sharing and more, in one easy-to-use app. Get started FREE today.
Terraria - Dig, Fight, Build! The very world is at your fingertips as you fight for survival, fortune, and glory.
Mattermost - Mattermost is an open source alternative to Slack.
Minetest - Minetest is a near-infinite-world block sandbox game and a game engine, inspired by InfiniMiner...