For last several months I've been building https://counterparts.ai, memory for claude modeled after human memory. It forgets older memories so things never get stale, it dreams to merge similar ones, it updates memories when facts change, it has prospective memory to remind you in the future, etc.

For me the coolest part is that it's claude's memory, so it actually develops a self identity too and gets to know you better over time. So that opens up new things, like I wanted to keep session cache from expiring so I just told it "when I type ping, just reply with pong" and because I used it several times that day, it automatically strengthened the memory and now it just does it. And if i stop doing it for long enough, it'll automatically fade away.

No stale files, no hundreds of md docs, and what it knows about me isn't limited to the 1 page built in memory file (both work great together btw, no need to choose). It's free, open source, and totally local, no api keys.