What tool are you using for better AI Memory across multiple LLMs?

There have been so many tools released recently for AI memory, an d I’m genuinely curious what you guys are using that has great MCP tools and what you like about it. If there was one thing you could change what would it be?

Disclaimer: I’m the creator of an open source tool called second-brain-Cloudflare and I’m trying to figure out what has and has not worked for you.