jGRASP is a free, lightweight IDE that supports Java, Python, C++, and more, offering visualizations, debugging tools, and cross-platform compatibility.
M.U.G.E.N is a free, customizable 2D fighting game engine for Windows that lets users create and play unique characters, stages, and retro-style games with ease
Microsoft Edge DevTools Preview is a developer suite offering advanced debugging, WebAssembly support, and realtime performance tools for modern web development
Processing is a free, open-source programming language and environment designed to teach coding through visual arts, with support for 2D, 3D, and PDF output.