Abraham Masri posted a Demo Houdini demo for iOS 10.x (up to 10.3.2) 64-bit only, he also claims this is not really a jailbreak but it does mimic some jailbreak functionalities. Now after nearly a month, he updated to beta 2 with new utilities. Now it supports 10.X to 10.3.2 and iOS 11 to 11.1.2. 

Here's his tweet:

Houdini beta 2 (iOS 11 support) with new utilities!https://t.co/t7xGjlOgtE

~ friendly reminder: please read the disclaimer before installing ~

— Abraham Masri (@cheesecakeufo) January 3, 2018

Here is What's new in beta 2

1. iOS 11 support

2. Faster startup time

3. Change Icon shapes (iOS 11)

4. System-wide ads Blocker (iOS 11)

5. Change Emoji fonts (iOS 11)

6. Change boot logo (iOS 11)

7. Add your face to Animoji (iOS 11) (X only

8. Themes temporarily disabled (iOS 11)

9. Added safety measurements

Before you install Houdini Demo on your iDevice, please check this carefully.