I made my own. I needed to have a calendar that showed every todo item per day, and a text editor to edit the tasks just like in a todo.txt. Used it all day every day for over 15 years. I still have it installed on nearly all my Win systems, just because it opens instantly, has priority and colors. I also used it to produce reports for work, so I eventually added export options for HTML to paste directly into an email.

https://github.com/DexterLagan/todo-master