rxvt-unicode: The old standby. Does not render some unicode characters correctly or at all because fallback font support is lacking. In danger of being unmaintained if it isn't already.
st: Crashes when exposed to thinking emoji. No clickable URIs.
kitty: Doesn't support using bright colors as bold. Doesn't support bitmap fonts, and
terminus-ttf is very bad looking.
alacritty: It's based on Rust.
extraterm: It's based on Electron.