The X1 Purple Wallet is an experimental port from Bitcoin (https://github.com/bitcoin/bitcoin), extended for X1, with alternating Proof-of-Stake. Each Proof-of-Work Block is followed by a Proof-of-Stake block.
It's currently in alpha stage (use only with small amounts of X1). Preview builds can be found in the Releases section.
X1 Purple Wallet is released under the terms of the MIT license. See COPYING for more information or see https://opensource.org/licenses/MIT.