I’ve been using Claude’s Projects feature and really like how it keeps everything for a given workstream in one place. I’m trying to find out what else is out there, ideally something more under the radar than the obvious big names. Three things matter most: I want to set persistent, project-specific custom instructions once so the tool knows my context and preferences every time, without re-explaining myself. I want to upload a large set of reference documents that live with the projec...