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ImHex is a free, featureful Hex Editor with many tools often only found in paid products. It includes a custom built scripting language for highlighting and decoding binary data, a disassembler, extensive file analysis tools and much much more.
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Graviton Editor is an open-source and cross-platform code editor tool that allows multiple programming features compatible with Windows, macOS, and GNU/Linux from the main website.
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A Java 8 Jar & Android APK Reverse Engineering Suite (Decompiler, Editor, Debugger & More).
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APK Editor Studio is an open-source Android application editor that allows you to edit APKs with the help of reverse engineering.
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APK Studio is an open-source Integrated Development Environment that allows you to recompile and decompile Android applications with its unified interface.
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Kaitai Struct is a formal language for binary format specification that can be compiled into parser code.