For organizational purposes, I would like to list my projects and break them into smaller steps, small tasks that can be completed.
I need something like Trello, for Windows, preferably open-source.
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You could use an open source alternative to Trello, still web based: Wekan.
How about ToDoList?
It might work for you, so maybe worth a try. But if you could add some specific requirements, as the commentator above suggested, others could suggest better options.
Eylean Board could be a good fit. Just like Trello it is an intuitive project board, where projects can be broken down into steps and tasks. You can then complete the tasks and add relevant information to visualize your current status and progress.
You can use it either with a team or alone and modify the board to your liking. It is not an open source solution though.