Yeah, there are a lot of clones, including Survivalcraft (for iOS) and there was one for 3DS before Minecraft was released there. Linden Labs' Blocksworld wasn't a strict clone of Minecraft, but was definitely an attempt to improve it. Also, Fortnite's Creative mode is heavily inspired by Minecraft - many staples of the Minecraft scene, such as 'spleef' games, are being replicated there.
