Percona uses Galera for Multi master MySQL replication

Does Percona uses Galera for Multi-master MySQL replication? My client has bad experience with Galera & not willing to go for it. Is there any other work around?

Yes, the true multi-master, with conflict resolution, synchronous transaction replication, etc is using Galera library. More details: https://www.percona.com/doc/percona-xtradb-cluster/5.7/index.html

Alternative solution is using MySQL Group Replication:
http://dev.mysql.com/doc/refman/5.7/en/group-replication-requirements.html