http://whirtorrgetftvz4g466sjqkegtyi35bjl4bvotfkfossunf5my4x6ad.onion/blog/bitcoin-mixing-legal
Whir is one of those tools as it allows for Bitcoin mixing for anyone, in a simple, cheap, fast and yet intuitive manner. So, if your only question was whether using tools such as these is legal, the answer in most countries around the world is yes.