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.
Aha - Aha! is the new way to create visual product roadmaps. Web-based product management tools and roadmapping software for agile product managers.
Notepad2 - Notepad2 is a fast and light-weight Notepad-like text editor with syntax highlighting.
ProdPad - ProdPad helps your team gather ideas, surface the best ones and turn them into product specs, and then put it all on a product roadmap.