Professional, open source diagramming. Online or desktop, no registration.
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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.
NASA Software Catalog offers hundreds of new software programs you can download for free to use in a wide variety of technical applications.
Quick-benchmark is a micro benchmarking tool intended to quickly and simply compare the performance of two or more code snippets.
online compiler and debugger for c/c++
GCC and MSVC C++ Demangler
Online draw math functions
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.