Notepad++ - A free source code editor which supports several programming languages running under the MS Windows environment.
productboard - Beautiful and powerful product management.
AkelPad - A simple notepad-like text editor with many features. It is designed to be a small and fast.
ConTEXT - ConTEXT is a small, fast, powerful and highly compact text editor for the Windows operating system.
Notepad2 - Notepad2 is a fast and light-weight Notepad-like text editor with syntax highlighting.
Aha! Business Model Builder - Create the perfect strategy for your product roadmap