Kcachegrind - Callgrind is a profiling tool and KCachegrind is able to visualize output of the profilers.
Sublime Text - Sublime Text is a sophisticated text editor for code, html and prose - any kind of text file. You'll love the slick user interface and extraordinary features. Fully customizable with macros, and syntax highlighting for most major languages.
Valgrind - Valgrind is an instrumentation framework for building dynamic analysis tools.
Notepad++ - A free source code editor which supports several programming languages running under the MS Windows environment.
dotMemory - dotMemory allows users to analyze memory usage in a variety of .NET and .NET Core applications.
Atom - At GitHub, we’re building the text editor we’ve always wanted: hackable to the core, but approachable on the first day without ever touching a config file. We can’t wait to see what you build with it.