OpenXcom Hit v1.0 on June 13. Check it out!
OpenXcom is an open-source rewrite of X-Com: UFO Defense/UFO: Enemy Unknown that features numerous engine enhancements (ie. resolution and filter options, tooltips, mouse wheel scrolling, and more) that enhance your X-Com experience without being a detriment to anything that made the original X-Com so great.
You can grab OpenXcom (original X-Com game required for OpenXcom to function) here: http://openxcom.org/downloads/
You can buy the original X-Com on Steam here: http://store.steampowered.com/app/7760
You can join my official Steam group here: http://steamcommunity.com/groups/dwtgaming
You can follow me on Twitter here: http://twitter.com/#!/DWTerminator
Want to know more about my channel? Check my about page here: http://www.youtube.com/user/DWTerminator/about