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Invader is an open source modding toolkit for Halo: Combat Evolved. It aims to re-implement tools of the HEK with an emphasis on tag data correctness, validation, and command line usage (although invader-edit-qt is a GUI tool). Invader is primarily developed by Kavawuvi, with contributions by Vaporeon.
At this time, Invader targets Halo Custom Edition with some support for MCC.