1993 video oyunu
- ^ Xargon 28 Ağustos 2012 tarihinde Wayback Machine sitesinde arşivlendi. Allen Pilgrim declared Xargon freeware and released the source code.
- ^ Xargon 18 Nisan 2016 tarihinde Wayback Machine sitesinde arşivlendi. Allen Pilgrim on pyra-handheld.com "I own the copyright for the game and have released the entire trilogy as freeware. The source code is also released as freeware. I am perfectly fine with people creating ports of the game and using all the assets for those ports. What I do not authorize is someone taking the assets and creating a new game."