Today, I learned about The Chandler Project, a doomed attempt to build a next-generation “personal information manager”, and it is wonderful. Just look at this beauty! Sadly, the project went bust more than a decade ago — the last update was in 2009 — but many thanks to whomever is paying to keep the lights on.
The initial development and decline of Chandler was described in the book Dreaming in Code by Scott Rosenberg which, yes, is now on the pile. (↬Thinking With Tinderbox)