Qt and KDE rely on the standard X Input Method (XIM) framework, and do not implement their own solutions.
Unicode | Input/output | Chinese input methods for computers | Smart Common Input Method | Intelligent Input Bus | X Input Method | Unicode equivalence | Unicode block | Q9 input method | input/output | CKC Chinese Input System | X Input Method (XIM) | Medieval Unicode Font Initiative | Input | input | Egyptian Hieroglyphs (Unicode block) | ConScript Unicode Registry | Basic Latin (Unicode block) |