I think folks who are serious about “tools for thought” should check out the work of Linus Lee. Linus has a different point of view on the topic that includes developing one’s own tools for thought, which thus are highly optimized to one’s thinking, but also focuses more on what to do after one writes stuff down rather than on the writing.
Andy Sylvester thank you for posting again about Linus Lee, I remember you posting about his Monicle search engine before. I have signed up for his newsletter, I hope to share my thoughts soon on his work.