Proof
Fomo
EssentialPIM
Todo.txt
Task Coach
CherryTree
Strikethru
Nudgify
ChainMemory
Mem0
Agentmemory
Memori
Tempreon
cognee
TheSecondBrain.dev
Suprflo
ChainMemory gives your AI agents persistent memory that belongs to YOU โ not to a single vendor.
Save a memory in ChatGPT, recall it in Claude or Gemini. Available via Chrome extension, MCP server (npm), or REST API. Every memory gets a cryptographic fingerprint and project states are anchored with Merkle proofs, so anyone can independently verify integrity โ no trust required.
Memories consolidate into a structured Project Brain (decisions, milestones, risks) instead of a pile of raw notes. Multi-agent native: Claude, Cursor and GPT share one consolidated state. Free tier available.
Proof
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Fomo - Fomo turns your site into the online equivalent of a busy store
Mem0 - Your private, local memory layer for all AI tools
EssentialPIM - EssentialPIM is a free Personal Information Manager that keeps up with the times and lets you manage appointments, tasks, notes, contacts, password entries and email messages across multiple devices and cloud applications.
Agentmemory - Persistent memory for Claude Code, Codex & coding agents
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
Memori - Persistent memory from agent trace, not just conversation