WebAssembly Explorer, located at https://mbebenita.github.io/WasmExplorer, provides similar functionality to WasmFiddle. It allows you to compile C or C++ to a Wasm module and view the corresponding Wat. However, WebAssembly Explorer provides additional functionality not present in WasmFiddle. For example, you can compile C or C++ to Wasm and view the corresponding Firefox x86 and LLVM x86 code. You can select from a list of code examples and specify the optimization level (-O flag in emcc). It also provides a button that allows you to import the code into WasmFiddle: