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The Common Open Research Emulator (CORE) is a tool for emulating networks on one or more machines. You can connect these emulated networks to live networks. CORE consists of a GUI for drawing topologies of lightweight virtual machines, and Python modules for scripting network emulation.
...The sandbox libraries are currently maintained by the OpenJudge Alliance (http://openjudge.net/) as a standalone, open-source project to facilitate various assignment grading solutions for IT/CS education.
See project page at https://github.com/openjudge/sandbox for details.
TSys2 is a open source on-line contest management and judge system (ACM/KIROV). It can be used in schools for education purposes and for programming contests.Consist of: server part,tester,admin GUI interface,GUI and web(alpha-stage) client.