Free "Minecraft" modifications, or mods, are available on the Internet for download from websites including Curse.com and MinecraftMods.com. The most popular mods for "Minecraft" on Curse.com as of October 2015 include Tinkers Construct, JourneyMap, CoFH Core, NotEnoughItems and Waila.
Mods are files that modify or add to the content and features of a game. Many popular "Minecraft" mods improve upon the original navigation and crafting systems. Mods generally come from individuals, small teams or communities of gamers, and are not usually endorsed or approved by the original developers. Modding a game is a safe and free way to extend the life of a video game as long as the mod files are acquired from reputable and trusted sources.