The Vision Keyboard is based AnySoftKeyboard developed by Menny Even Danan. It's an open-source, on-screen keyboard with multiple languages support with emphasis on privacy. This is one of the most customizable keyboards available.

Main features:

• Multi languages keyboard support via external packages.
• Completion dictionaries for multiple languages.
• Also completes your typed words from you contacts names!
• And, learns your typing behavior to provide next-word prediction.
• Multi-Touch support (as in, pressing SHIFT along with other characters).
• Extension keyboard (swipe your finger all the way up out of the keyboard).
• Compact/Phablet Mode.
• Gesture support
• Experimental Gesture-Typing (enable in the Settings app).
• Swipe left or right to switch layouts.
• Swipe up to shift.
• Swipe down to close the keyboard.
• Theme support (comes with a few built-in skins, and more available in Play Store).
• Night Mode: Quiet, Dark keyboard at night time (enable in the Settings app).
• Power-Saving Mode: No vibrations, sound, suggestions and a dark theme (enable in the Settings app).
• Build-in user dictionary words editor.
• Build-in abbreviations dictionary: create shortcuts for words and sentences.
• Utility keyboard (swipe up from space-bar):
• Clipboard actions copy, paste, select-all, select selectively (long-press select and use arrow keys).
• Voice input
• Arrows
• And many more features!