Like a product roadmap? You could try sticky notes on a whiteboard, they're easy to rearrange while you're shaping the roadmap and give you a good high-level o

Like a product roadmap? You could try sticky notes on a whiteboard, they're easy to rearrange while you're shaping the roadmap and give you a good high-level overview. Productboard is quite good (https://www.productboard.com/ https://www.productboard.com/), if it fits your requirements - I've made good use of it in the past for product planning.