Fcitx5

Supported languages

English (with spellcheck)

Chinese

Pinyin, Shuangpin, Wubi, Cangjie and custom tables (built-in)

Zhuyin/Bopomofo (via Chewing Plugin)

Jyutping (via Jyutping Plugin)

Vietnamese (via on UniKey Plugin, supports Telex, VNI and VIQR)

Japanese (via Anthy Plugin)

Korean (via Hangul Plugin)

Sinhala (via Sayura Plugin)

Thai (via Thai Plugin)

Generic (via RIME Plugin, supports importing custom schemas)

Features

Virtual Keyboard (layout not customizable yet)

Expandable candidate view

Clipboard management (plain text only)

Theming (custom color scheme and background image)

Popup preview on key press

Long press popup keyboard for convenient symbol input

Symbol and Emoji picker