Skybox:
 Beherith
 
 
Detail Textures:
 Beherith
 jylhis (http://jylhis.deviantart.com/)
 
 
Volumetric Clouds shader widget (https://github.com/Anarchid/spring_volfog):
 Anarchid, consulted and optimized by jK
 
 
Lava Shader package (http://springfiles.com/spring/lua-scripts/lava-shader-drop-package):
 Assembled by The_Yak
 Knorke, Beherith, Anarchid, The_Yak - Lava gadget
 Audionautics, e__ - Lava SFX from freesound.org
 lava textures - yhughes, mavrosh, sadronmeldir
 Kloot - Hover waterdamage workaround
 [BoS]nixtux - Improved lavasplosions
 
 
Crack effects:
 PenguinTutorials (http://www.dailymotion.com/video/xmv6kr_gimp-crack-effects-generating-advanced-tutorial_school)