Windows

Clock

A small, always-on-top desktop clock for Windows. It lives in the system tray, shows the time in a compact translucent, rounded window (150×70, ~78% opaque) and is perfect as a lightweight floating time display that stays above your other windows.

Build script (build.bat) Download source (Clock.cpp)

Build from source: download Clock.cpp and build.bat, then run build.bat in the folder (requires MinGW-w64 / g++). Free and open — no installation needed.