www.deepl.com
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valgrind
Valgrind is an instrumentation framework for building dynamic analysis tools. There are Valgrind tools that can automatically detect many memory management and threading bugs, and profile your programs in detail. You can also use Valgrind to build new tools.
https://www.onlinegdb.com/online_c++_compiler
online compiler and debugger for c/c++
godbolt.org
Compiler Explorer is an interactive tool that lets you type code in one window and see the results of its compilation in another window. Using the site should be pretty self-explanatory: by default the left hand pane is the source window and the right hand has the assembly output.