9420 Tablet Keyboard is a free Thai/English keyboard software designed for tablet devices, and optimized for text-hungry apps such as Line, Twitter, and more. It comes with a built-in "Full" Thai/English word database and is based on R4.0. The software was developed by Solution 9420 and was first published on March 3rd, 2010.

The keyboard design is user-friendly, and the software is easy to install. Once installed, users can switch between Thai and English languages with ease. The keyboard also offers excellent predictive text functionality, which makes it perfect for those who type frequently on their tablets. Additionally, the keyboard is customizable, and users can adjust the size and layout of the keyboard to suit their preferences.

Overall, 9420 Tablet Keyboard is an excellent option for those looking for a free Thai/English keyboard software for their Android tablet. It is user-friendly, easy to install, and offers excellent predictive text functionality. Updates for the software can be found on the developer's website or Twitter page.