Sigma is a minecraft client that was published in 2013 by RandomAmazingGuy and Arithmo, but it is rumored that there are versions of 2011 that are lost. This client in 2017 began to focus on Hypixel being functional mostly in this, it remained a client dedicated to Hypixel until 2020 with the release of version 5.0 which would expand to most servers either with Verus or servers such as MMC, Mineplex, Cubecraft and many others to date
There is not much to talk about this client, but we can talk about the famous controversy that it was a virus that could damage your PC or the best known that it was a BTC miner or a monero miner, as far as it is known, It is not a virus but there is still a lot of discussion about whether it is a miner or not, although the client developers have already defended themselves with proofs.
Client Creator/Developer Channel: https://www.youtube.com/channel/UCscQrkjFxjwP_gaoggIun7g
Download the client completely free: