Cecil is a library written by Jb Evain to generate and inspect programs and libraries in the ECMA CIL format. It has full support for generics, and support some debugging symbol format. In simple English, with Cecil, you can load existing managed assemblies, browse all the contained types, modify...
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Embeds translations (satellite assemblies) automatically into the exe/dll itself during the build process and hooks up code to extract them dynamically during runtime.
Once installed, you don't have to deploy all those "language code" folders anymore as they will be read from the resource section...
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Common building blocks used INTERNALLY by MonoMod and Harmony which can be used to build your own libraries, f.e. RuntimeDetour's platform abstraction and Utils' DynamicMethodDefinition. For code that is ready to use reliably, use MonoMod.Utils.
Fody add-in for forcing referenced assemblies to be loaded on startup. This allows other modules to register types without actually having to using their types directly.
Utilities and smaller MonoMod "components" (f.e. ModInterop, DynDll, DynData). Can be used for your own mods. Required by all other MonoMod components.