Those, that I write down, I put in my big personal iMap, or now Infinity Maps. But frankly, I do not systematically manage business ideas, since I don't have time for most of them. And the good ones keep coming back to me anyway.
I use Qinaps , it is a note taking platform which provides collaboration and kanban features along with many more. They also have the free starter plan, Try Qinaps and check the result yourself
@bahaa I use notion, then move my thinking process to Miro board and then share the miro board to a select few who help me narrow it further before I take it to the user-interview phase ๐๐ผ
Infinity Maps