Reality Factory

i was round a friends house and he showed me this texture pack creator that in conjunction with a graphics pacage, it sugests using photoshop, but it will create seamles tieling and because its all computer generated so there is no licence you have to wory about and they look as good as the real thing, there may be some licensing with the textures that are provided but im not sure, the down side to this is the price they all seem very expensive but in my opinion they are greate.

here is the site http://www.doschdesign.com

but other than the price i think it seems realy good for game creation

Photoshop in itself will make seemlessly tiling textures for textures that are too active to manually do so like grass, brush, etc.

Anything else can be made to tile with little effort. I make all of my textures 100% in photoshop alone. From grass to rusted metal.