There are 3 repositories under keyboard-extension topic.
KeyboardKit is a Swift SDK that lets you create fully customizable keyboards with a few lines of code, using SwiftUI.
KeyboardKit Pro helps you create custom keyboards for iOS and iPadOS.
A simple clone of the iOS system keyboard with SwiftUI
React Native Keyboard Template For Keyboard Extensions
Objective C/Swift compatible implementation of autocorrect for iOS.
⌨️ Keyboard extension tutorial using reactorkit
Organization files
iOS ASCII Emotes Keyboard built using UIKit