It's a free game that's like Minecraft as an MMO.
https://trovelive.trionworlds.com/account/reg/account-registration-short-flow.action?voucherCode=Z97GNRXC2MX6Q3YMGNCP&request_locale=en&experience=aaf&utm_source=manual&utm_medium=social&utm_campaign=ascend_invite Here's my recruit link.

This is rather late, but for those of you who don't know, it's a free source mod based off of Team Fortress Classic and has now made it on Steam! Give it a whirl, it's basically Team Fortress Classic with better graphics.