Dual Space - It is a first application that is compatible with WhatsApp completely.
App Cloner - Clone your Android apps so you can use multiple logins.
island - a free and opensource alternative to parellel space
Shelter - Isolate your Big Brother Apps
Dual Space Lite - Dual Space Lite – Multiple Accounts and Clone App is a light version of the world’s most potent multi-account app that provides the lightest installation package, saves more system resources, and runs much faster.
Multiple Accounts - Multiple Accounts: Parallel App is a free to use mobile app that helps you to run multiple accounts of the same application at the same time over a single phone.