What are some alternatives?
When comparing Voxelands and Radware, you can also consider the following products
Terasology - Terasology (started under the name Blockmania) is an open source project started by Benjamin...
OneNeck IT Solutions - OneNeck provides a comprehensive suite of enterprise-class IT solutions that are customized to fit your specific needs.
Terraria - Dig, Fight, Build! The very world is at your fingertips as you fight for survival, fortune, and glory.
RSA - See why RSA is the cyber security market leader and how digital risk management is the next cyber security frontier. Get best practices & research here.
Minetest - Minetest is a near-infinite-world block sandbox game and a game engine, inspired by InfiniMiner...
McAfee Security Services - With a global professional services organization, McAfee provides security consulting, security education, and product and solution deployment services to customers around the world.