EnTT - Header-only C++ game development library with innovative ECS (Entity-Component-System).
PyLint - Pylint is a Python source code analyzer which looks for programming errors.
EntityX - Fast, type-safe C++ ECS (Entity-Component System).
flake8 - A wrapper around Python tools to check the style and quality of Python code.
Entitas - Entity Component System Framework for C# and Unity
PEP8 - pep8 is a tool to check your Python code against some of the style conventions in PEP 8.