Unexpected Keyboard | F-Droid - Free and Open Source Android App Repository
A really really cool keyboard on Android that is made to work well with Termux and mimic the feel of typing on an actual physical keyboard (no need to switch between menus, bother with autocompletion and suggestions, long-press, etc). You can easily select, navigate and add complex characters very quickly in one tap. The keyboard is also very customizable, light and responsive/fast.