Cena
Cena is an open-source judging tool written in Pascal by Liu Qishuai and Li Zixing, and is the most widely used local judging tool. Cena was initially open-sourced on the Google Code platform, but Google deleted the Cena project for unknown reasons. Its official website can currently be found on the Web Archive.
Cena's restrictions on permissions are not very clear; during testing, it is possible to read a test point's AC.
Cena's source code is hosted at oi-archive/cena.